Shocker SFT Firing Assembly ZDSPB.com > Tech index > Shocker SFT > Parts of a Shocker > Firing assembly
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The term firing assembly refers to the bolt and other surrounding components used within the marker. The Shocker's main moving part is the bolt itself, which interacts with three other components when firing a ball. There were multiple aftermarket firing assembly components available, all listed later.

The four parts of a Shocker stock bolt kit include the bolt itself, bolt guide, bolt sleeve, and fire chamber.
Bolt: Thin, elongated piece with an o-ring at the rear, and some porting toward the front.
Bolt sleeve: Large, flared component that slides around the rear of the bolt, and is what actuates the movement of the bolt back and forth.
Fire chamber: Can-shaped piece which functions as a dump chamber to fire the paintball, through which the bolt slides.
Bolt guide: Thin shaft that is inserted into the back of the bolt, onto which it slides. The bolt guide delivers the release of air to fire the paintball at the front end, and is threaded to screw into the Shocker body at the rear end.

Firing assembly
Above: an assembled Shocker bolt kit.

Firing assembly
Above: a disassembled stock non-HE bolt kit. Note the bolt color may vary (brown, green, silver, black).

Firing assembly
Above: a disassembled "HE" high efficiency bolt kit. Note the bolt color may vary (brown, green, silver, black).

Information relating to how the marker operates, design concepts, and other technical specs can be found on the Design & Theory page (refer to the Related Links section at the bottom of the page).

Aftermarket Bolt Assemblies:
Many companies have produced replacement bolts for Shockers over the years; each bolt is listed in the below chart for comparison (along with a picture). The vast majority of these bolts are no longer in production, aside from the secondhand market.

Generally speaking, aftermarket bolts have the advantage of increasing shot efficiency and can also aid in ridding the marker of FSDO (first shot dropoff). Shockers came with the non-HE stock bolt for several years, which prompted the race for aftermarket bolt assemblies between NDZ, Evolve, and Freeflow (the Smart Parts HE bolt was also an option). However, the HE bolt was made a factory component in Shocker NXT markers, so the necessity of aftermarket bolts was diminished because most didn't offer a practical advantage compared to the HE system.

Coming into the year 2009, the Shocker spring mod became popular. This modification involves adding a spring-assist in the forward direction, which helps to reduce FSDO and often increase efficiency. However, the factory bolts required a modification to increase their inside diameter to make room for the spring. It was at this time that spring-compatible bolts became available from NDZ, TechT, Pooty, and others.

Bolts compatible with "HE" components:
Smart Parts
SFT stock bolt
The stock bolt can be easily identified by its single row of round air ports, unlike "HE" style bolts which have elongated slots. The common name for these bolts is the "SFT stock bolt" because they were only used with SFT-era markers (2003-2006); compared to the later Shocker NXT markers which came stock with the Smart Parts HE bolt kit.
There have been many versions of the stock bolts over the years. The orignal design called for a delrin bolt, which was used in 2003. This was replaced with an aluminum bolt coming into 2004, which was used for the remainder of the marker's lifetime. The problem with delrin bolts is they were much easier to scratch and damage, although they can sometimes achieve higher performance in certain situations. 100% delrin bolts are uncommon in ANY spool valve marker due to decreased reliability in the long term.
Smart Parts aluminum bolts are made from 7075 aluminum and hardcoat anodized in either a grey, green, or polished silver appearance. See the below section on bolt bumpers. The grey/green bolts are older and use the square urethane bumper, while polished bolts use a standard 15/90 o-ring as a bumper.
Bolt face: Round cup with four drilled air ports
Smart Parts bolt face
.
SFT stock bolt (green version)
SFT stock bolt (green version)

SFT stock bolt (polish version)
SFT stock bolt (polish version)

SFT stock bolt (original 2003 delrin version)
SFT stock bolt (original 2003 delrin version)
Smart Parts
HE (high efficiency) bolt
Turbocharger bolt
Smart Parts' OEM bolt upgrade uses an o-ring to seal the fire chamber's inlet ports when the bolt reaches the forward/firing position, which tends to increase air efficiency. These bolts were offered as an upgrade kit for $80 until 2007 when the Shocker NXT was released, at which point they became factory parts on all Shockers. Most private label Shocker SFT markers used an HE bolt as a standard upgrade.
Many aftermarket bolts are commonly referred as "HE style" bolts because they share a very similar design and most parts are compatible with one-another. All HE-style bolts require the HE fire chamber with removeable front cap for disassembly.
As with the SFT stock bolts, Smart Parts HE bolts are made from 7075 aluminum and hardcoat anodizied in either grey, green, polished silver, or black. See the below section on bumpers. The grey/green bolts are older and use the square urethane bumper, while polished and black bolts use a standard 15/90 o-ring as a bumper. The polished silver and black bolts are identical, the only difference is their age: polished silver bolts were used around 2005-2006, whereas black bolts were used in Shocker NXTs.
Bolt face: Round cup with four drilled air ports
Smart Parts bolt face
.
HE bolt (green version) installed in HE fire chamber
HE bolt (green version) installed in HE fire chamber

HE bolt (polish version) installed in HE fire chamber
HE bolt (polish version) installed in HE fire chamber
Evovle Paintball
ULP bolt kit
Evolve released an HE-compatible bolt in 2007, meant to be used with other HE-style bolts and parts. The ULP fire chamber features open milling and also uses the same side o-ring system as the previous Evolve v2 bolts (1x20-mm ID o-rings), so it can only be used in a "sealed" shocker body (see chart below on compatibility). These parts are compatible with other HE components, and can be used with the factory bolt sleeve and bolt guides.
Bolt face: Open face
Evolve ULP bolt face
with smaller diameter to reduce rollback.
Evolve ULP bolt and fire chamber
Evolve ULP bolt and fire chamber
New Designz
Stinger bolt v1 & v2
NDZ quickly jumped into the Shocker market with their Stinger bolt from 2004, which was essentially a replica of the SFT delrin stock bolt but with angled air porting and a slightly redesigned fire chamber. These were soon replaced with the Stinger v2 kit which was identical except made from aluminum. The v1 and v2 bolts both have almost no performance advantages. NDZ Stinger v1 delrin bolt and fire chamber
NDZ Stinger v1 delrin bolt and fire chamber

NDZ Stinger v2 aluminum bolt and fire chamber
NDZ Stinger v2 aluminum bolt and fire chamber
New Designz
Stinger bolt v3
The NDZ Stinger v3 bolt is an HE-style combo that was a fairly popular upgrade before the HE bolt became a stock upgrade. The v3 bolts were available with a variety of different fire chamber types depending on your Shocker body and performance goals:
1. LP fire chamber
NDZ LP fire chamber with side o-rings
with side o-rings (15/70): The default fire chamber; compatible with sealed PL Shocker bodies and the base model Shocker SFT body.
2. ULP fire chamber
ULP fire chamber
with open milling: Increased air volume, works with sealed PL Shocker bodies only.
3. Enclosed "standard" fire chamber
Enclosed "standard" fire chamber
: Unmilled fire chamber similar to the SP version, compatible with any Shocker body but offering the lowest air volume compared to the other NDZ options.
Due to the air volume differences between these fire chambers, each allows for a different range of operating pressures. However, there aren't any discernable differences aside from the change in pressure.
Bolt face: varies depending on age
NDZ Stinger v3 bolt faces
. Older bolts were open-faced, but porting was later added to facilitate easier disassembly.
NDZ Stinger v3 bolt and v3 'standard' fire chamber
NDZ Stinger v3 bolt and v3 "standard" fire chamber

NDZ Stinger v3 bolt and v3 'LP' fire chamber
NDZ Stinger v3 bolt and v3 "LP" fire chamber

NDZ Stinger v3 bolt and v3 'ULP' fire chamber
NDZ Stinger v3 bolt and v3 "ULP" fire chamber
New Designz
Stinger bolt v3m
The Stinger v3 bolt was revitalized in 2010, adding a widened rear portion for use with a spring mod. The bolt was otherwise identical and used the same NDZ fire chambers found in previous kits. These bolts came with their own spring, which is very similar in size to the Rhino spring, but not an actual Rhino spring. The NDZ Stinger v3m were the last official NDZ Shocker bolts to be produced.
Bolt face: 5 milled air ports
NDZ v3m bolt face
.
NDZ Stinger v3 spring modded bolt
NDZ Stinger v3 spring modded bolt
Smart Parts
Modified delrin HE bolt
The original non-HE delrin stock bolts could be modified to add HE functionality (this mod involved cutting a new HE o-ring groove, and drilling a new series of ports). These bolts performed nicely, but they lack the long-term reliability of other bolts due to the delrin construction. Once upon a time this was a fairly exclusive modification; unfortunately not many delrin HE bolts have survived to current days. NDZ Stinger v3 spring modded bolt
NDZ Stinger v3 spring modded bolt
NoX
NV bolt v1.0 & v1.5
Team Naughty Dogs used these polymer bolts which were also available to the public. The NV bolts were made from a material called Ertalyte which is similar in appearance to delrin however meant to be more resiliant to scratching/abrasion. The bolts perform similar to an enhanced HE-style delrin bolt, which have very low recoil due to the lightweight moving mass, but with added reliability from the stronger material, and also the use of bolt bumpers.
The biggest change with NoX bolts was the glued o-ring inside the bolt face, which helps to ease the bolt transition into the barrel and guard against barrel breaks. They also reduce rollback due to the open face hole having a smaller diameter.
The original NV version-1 bolts were white in color, whereas the version-1.5 bolts were black. The only change is the front tip o-ring size.
Bolt face: Open face with glued o-ring
NV bolt face
.
Nox NV bolt (version 1.0)
Nox NV bolt (version 1.0)

Nox NV bolt (version 1.5)
Nox NV bolt (version 1.5)
NoX
Kilo / Stopping Power bolts
The Nox bolt underwent further development and was redesigned into the Kilo bolt, which uses an aluminum insert to guard against scratching and bolt wear over prolonged use. Despite the previous NV bolts made from Ertalyte, they could still be damaged if used enough; this issue was resolved by adding an aluminum sleeve component, which adds the reliability of an aluminum bolt with the lightweight mass of a polymer bolt.
The original Kilo bolts feature a "long" aluminum insert in the front, whereas the Kilo Stopping Power bolts use a shortened version of the same insert. The Kilo Stopping Power bolts were lighter due to the smaller aluminum insert.
Bolt face: Open face with glued o-ring
Kilo bolt face
.
Nox Kilo bolt
Nox Kilo bolt

Nox Kilo Stopping Power bolt
Nox Kilo Stopping Power bolt
Lurker Paintball
Shocker Eigenbolt
A unique Shocker bolt that was in development for many years prior to eventual release in 2013. This bolt was originally designed to use the polymer Ertalyte-TX, but was switched to a white magnesium-based alloy for increased reliability and lightweight mass. The Magnesium bolts were very lightweight, but expensive to produce. Later a green aluminum version was released to keep costs down. Eigenbolts feature a set of venting ports designed to assist with cycling speed, used in conjunction with the built-in spring mod (Rhino spring included). Using this bolt generally requires a period of tuning and experimentation to balance the operating pressure and dwell settings, so there's a bit of a learning curve associated with them. It's generally agreed upon that you can achieve best performance with this bolt once the marker is tuned correctly.
Bolt face: Open face
Eigenbolt bolt face
.
Lurker Shocker Eigenbolt (magnesium version)
Lurker Shocker Eigenbolt (HE-style magnesium version)

Lurker Shocker Eigenbolt (aluminum version)
Lurker Shocker Eigenbolt (aluminum version)
Smart Parts
HE Foamie-modded bolt
These special bolts were available to Smart Parts sponsored teams using Shockers, but eventually ended up in the hands of the public when markers were sold secondhand. The bolts were identical to typical SP HE bolts, but the tip was redesigned to hold a small foam pad (commonly called a "foamie") which is meant to be more gentle on paint in much the same way as the NoX NV & Kilo bolts used an o-ring on the front. The foamie pad is compatible with the parts available from AirGun Designs (AGD) markers which use a similar pad system.
Foamie HE bolts were anodized either red or blue. They also commonly came with a modified bolt sleeve that used a different series of air transfer porting, which performs similar to the OEM bolt sleeve but has a very different appearance.
HE Foamie bolt (blue bolt shown)
HE Foamie bolt (blue bolt shown)
HE Foamie bolt (red bolt shown)
HE Foamie bolt (red bolt shown)
TechT
Enertia bolt
These bolts are very similar to the SP HE design but feature an added spring mod in the back. The bolts are open faced and meant to be very lightweight as with many of TechT's other items, but the drawback is increased ball rollback due to the large face opening. While these are made to be used with a spring mod, the TechT bolt will not work with the common Rhino spring. Instead these bolts are meant to be used with a proprietary TechT spring.
Bolt face: Open face
TechT bolt face
.
TechT Enertia bolt
TechT Enertia bolt
Pooty Paintball
Shocker bolt
Likely the last bolt to be developed for Shockers, this one is also very similar to the HE design but with an added spring mod and "QEV" venting ports similar to the Lurker Eigenbolt (Pooty v1 only). Pooty bolts are flat-faced with an array of porting on the front, so they have very little rollback. However, the flat face lets the bolt contact the ball on its weakest point, so brittle paint can be problematic.
Pooty v2 bolts removed the QRV vent ports and added an outside sealing o-ring at the very front of the bolt. They can be used without the SFT o-ring.
These bolts are pink in color and were manufactured by NDZ specifically for Pooty Paintball.
Bolt face: Flat face with 9 ports
Pooty bolt face
.
Pooty Shocker bolt
Pooty Shocker bolt v1
Pooty Shocker bolt v2
Pooty Shocker bolt v2
Bolts using unique designs; not compatible with "HE" components:
Evolve Paintball
v1/v2 bolt kits
Evolve was the first company to release an upgrade Shocker bolt, even before Smart Parts' HE bolt. Evolve's v1 and v2 bolt kits both consist of an entire new firing assembly (bolt, fire chamber, bolt guide, and bolt sleeve). The fire chamber was re-designed and none of the components are compatible with an HE-style component (except for the bolt guide). The bolt guide can be used with other internals, but none of the other components will function. The Evovle fire chamber uses side o-rings to seal base model Shocker body, therefore cannot be used with some private label Shocker bodies due to their milling. The Evolve bolt and bolt sleeve are slightly enlarged to allow for lower operating pressure, which prevents them from being used with any other Shocker assembly.
The Evolve bolt kits were available in two versions (v1 and v2). The v1 bolt had cycling isses and was replaced with v2 bolts at no charge when Evolve was in business. The v2 bolts are therefore much more common and prevalent.
Bolt face: Open face
Evolve v1/v2 bolt face
.
Evolve v2 bolt kit
Evolve v2 bolt kit

Evolve v1 bolt drawing
Evolve v1 bolt drawing
Freeflow
bolt kit v1 & v2
Freeflow bolts are difficult to classify because they use a unique non-HE design, yet they aren't compatible with any other Shocker internals. The bolt uses an added "seal ring" inside the fire chamber which shuffles air pressure around during firing. This design ended up being fairly unreliable and was often the cause of disassembly problems due to the seal ring coming loose during play. Freeflow bolts are extremely uncommon in present day, because the system is more complex compared to HE kits. Freeflow bolts also seem to experience anodizing wear over time.
Freeflow bolt kits came with all four components (bolt, fire chamber, bolt sleeve, and bolt guide) however the bolt guide and bolt sleeve were compatible with other Shocker internals, though they offered no performance advantage. Freeflow bolts also came stock on Freeflow Shocker SFTs.
Freeflow v2 bolts use D-shaped porting and a 10-port venturi face. The older v1 bolts used standard round ports to fire, and a 5-port venturi face. Some v1 bolts were re-milled into v2.
Bolt face: Older bolts used a 5-port design
Freeflow bolt face
. This was later changed to a 10-port design but still used a cupped shape.
Freeflow v2 bolt and fire chamber
Freeflow v2 bolt and fire chamber

Fire Chamber Compatability:
This chart shows which fire chambers cannot be used in certain marker bodies. The difference between bodies is whether or not they're milled around the fire chamber area of the bolt's bore, which exposes the internal bore to the outside of the marker.
1. Sealed fire chambers are fully enclosed and do not leak any air pressure around the outside the fire chamber. They can be used in any body.
2. Milled fire chambers have cuts made to their periphery in order to increase the air volume available when firing. They can only be used in specific bodies.

Shocker model: SP HE
fire chamber:

SP HE fire chamber
SP HE fire chamber
NDZ v3 LP
fire chamber:

NDZ v3 LP fire chamber (using side o-rings)
NDZ v3 LP fire chamber (using side o-rings)
NDZ v3 ULP
fire chamber:

NDZ ULP fire chamber
NDZ ULP fire chamber
NDZ v3 sealed
fire chamber:

NDZ sealed fire chamber
NDZ sealed fire chamber
Evolve v1/v2
fire chamber:

Evolve v2 fire chamber (using side o-rings)
Evolve v2 fire chamber (using side o-rings)
Evolve ULP
fire chamber:

Evolve ULP fire chamber (using side o-rings)
Evolve ULP fire chamber (using side o-rings)
Freeflow
fire chamber:

Freeflow fire chamber
Freeflow fire chamber
Base model SFT
Base model SFT
compatible
compatible
not compatible
compatible
compatible
compatible
compatible
Sealed bodies:
Dynasty SFT (pre-06)
Dynasty SFT (pre-06)

Nasty SFT
Nasty SFT

Nasty NXT
Nasty NXT

Naughty Dogs NXT
Naughty Dogs NXT

Octane SFT
Octane SFT

Strange SFT
Strange SFT

Strange pre-Cup SFT
Strange pre-Cup SFT

Strange NXT
Strange NXT

Toxic SFT
Toxic SFT

Tonton SFT
Tonton SFT

Tonton NXT
Tonton NXT
compatible
compatible
compatible
compatible
compatible
compatible
compatible
Milled bodies:
Base model NXT
Base model NXT

Dark SFT
Dark SFT

Dynasty SFT (06+)
Dynasty SFT (06+)

Dynasty NXT
Dynasty NXT

Evil NXT
Evil NXT

Freeflow SFT
Freeflow SFT

G-Max SFT
G-Max SFT

Hybrid SFT
Hybrid SFT

Hybrid NXT
Hybrid NXT

Octane NXT
Octane NXT

Russian Legion NXT
Russian Legion NXT

Shocktech SFT
Shocktech SFT

Shocktech NXT
Shocktech NXT

Tremor NXT
Tremor NXT
compatible
not compatible
not compatible
compatible
Not compatible with most bodies.
(Compatible with Dynasty '06 SFT and Dynasty NXT)
compatible

Bolt Guides:
Shockers have a large array of bolt guide appearances from the many private label markers that were produced over the years. Private label bolt guides are identical to the standard "HE" bolt guide, but have different milling on the outside face. Additionally, several aftermarket bolt guides have also been produced over the years, which sometimes alter performance.

Smart Parts Private Label bolt guides:
Base model SFT
Base model SFT bolt guide
This bolt guide came stock on most base model Shocker SFT markers, sold between 2003-2006. There were two versions of this bolt guide, the old "non-HE" style has no depression between the two front 12/70 o-rings, which was later added to increase air volume for HE bolts. All other Smart Parts bolt guides use the HE style shap.
These bolt guides came stock as silver gloss finish, but SP sold other gloss colors such as red, black, and blue starting in 2005. Some private label markers came with color-matched guides. Dust finish is uncommon.
Base model NXT
Base model NXT bolt guide
This bolt guide was used as a stock part on base model Shocker NXT markers between 2006-2009. Virtually all of these guides use a dust finish, and most were color-matched to the rest of the marker.
Dynasty '05 SFT
Dynasty '05 SFT bolt guide (photo from InToX@pbnation)
This bolt guide originated on Dynasty SFT Shockers produced between 2005-2006.
Dynasty '06 SFT
Dynasty '06 SFT bolt guide
Dynasty '06 SFT bolt guide
This bolt guide originated on Dynasty SFT Shockers produced between 2005-2006.
Dynasty NXT
Dynasty NXT bolt guide (photo from stup1dhurts)
Dynasty NXT bolt guide (photo from A. Shreenan)
This bolt guide originated on Dynasty NXT Shockers.
Evil NXT
Evil NXT bolt guide (picture from J. Delaney)
This bolt guide originated on Evil NXT Shockers.
Freeflow PL
Freeflow bolt guide (picture from SOUP-13)
This bolt guide originated on Freeflow private label SFT Shockers and was made by Smart Parts. The bolt guide says "FREE FLOW TECHNOLOGIES" on the back. This is not the same as the Freeflow v1/2/3 bolt kit, which was an aftermarket part.
Naughty Dogs NXT
Naughty Dogs NXT bolt guide
This bolt guide originated on Naughty Dogs NXT Shockers.
Octane NXT
Octane NXT bolt guide (picture from Pooty Paintball)
This bolt guide originated on Octane NXT Shockers.
Quickshot SFT
Quickshot NXT bolt guide (picture from mr-fish@pbnation)
This rare bolt guide was manufactured for an SP-sponsored team in 2005. The number of Quickshot bolt guides is unknown, but there are probably less than 20 as an estimate.
Russian Legion NXT
Russian Legion NXT bolt guide (picture from dougy8505)
Russian Legion NXT bolt guide
This bolt guide originated on Russian Legion NXT Shockers.
Shocktech NXT
Shocktech NXT bolt guide
This bolt guide originated on Shocktech NXT Shockers.
Shocktech SFT
Shocktech SFT bolt guide (picture from kenrupp@pbnation)
This bolt guide originated on Shocktech SFT Shockers.
Strange NXT
Strange NXT bolt guide (picture from DCrump301@pbnation)
Strange NXT bolt guide (picture from Propel Paintball)
This bolt guide originated on Strange NXT Shockers.
Strange SFT
Strange SFT bolt guide
Strange SFT bolt guide (picture from scorchingcold14)
This bolt guide originated on Strange SFT Shockers.
Tonton NXT
Tonton NXT bolt guide (picture from A. Jones)
Tonton NXT bolt guide (picture from K. Lipscomb)
This bolt guide originated on Tonton NXT Shockers.
Tonton SFT
Tonton SFT bolt guide
This bolt guide originated on Tonton SFT Shockers.
Tremor NXT
Tremor NXT bolt guide (picture from MiSFiT4220@pbnation)
Tremor bolt guide (picture from PBFreak33@pbnation)
This bolt guide originated on Tremor NXT Shockers which were limited markers. Later this same bolt guide was also used on Nasty NXT Shockers.
Warped Sportz Dark SFT
Warped Sportz Dark SFT bolt guide (photo from SuzukiRider987@pbnation)
Warped Sportz Dark SFT bolt guide (photo from K. Lipscomb)
This bolt guide originated on Warped Sportz Dark SFT Shockers.
Aftermarket bolt guides:
Bloodline Quickdraw
Bloodline Quickdraw bolt guide
This tool-free bolt guide houses a set of 9-mm bullet casings within its endcap. The brass casings are empty inside. This bolt guide was released in 2007; it was the second Shocker item from Bloodline. The original price was $50 from Bloodline direct.
Bloodline Pear
Bloodline Pear bolt guide
This tool-free bolt guide offers unique cosmetics while still being small in size. This bolt guide was released in 2007; it was the first Shocker product from Bloodline (Tyler Micaud) following a similar design as the other Pear-style endcaps from Bloodline. The original price was $50 from Bloodline direct.
Cash Money
Cash Money bolt guide (picture from CDRBLING@pbnation)
Custom Tyler Michaud bolt guide (technically a Bloodline item). These are extremely rare; the history behind them has been lost to time (until somebody tells me!)
Evolve kit
Evolve kit bolt guide
Evolve kit bolt guide (picture from knuckhead09@pbnation)
Evolve bolt kits (v1 and v2) use this bolt guide. They require a larger 1/4" allen key for removal. While the other kit components can only be used together, the bolt guide can be used with most other firing assembly internals since it uses factory specs for the o-rings. Originally the Evolve bolt guides were available in black, silver, red, or blue (matching the rest of the upgrade kit).
Freeflow kit
Freeflow kit bolt guide
Freeflow upgrade bolt kits (v1, v2, v3) shipped with this "FF" bolt guide. Note that private label Freeflow Shockers did not generally come with this bolt guide unless the kit was purchased at the same time; instead the Freeflow Shockers came with a unique branded bolt guide that was manufactured by Smart Parts, like most other private label markers.
Hybrid tool-free
Hybrid tool-free bolt guide
The Shocker Hybrid bolt guides were extremely popular because they were the first tool-free guide released for the Shocker platform in 2005. Hybrid made two different versions of their Shocker bolt guide, the main difference being the size and shape of the knurled grip on the endcap area. If the bolt guide were purchased as a standalone upgrade, you would receive the version with large-size grip. This version did not come on Hybrid private label Shockers.
Hybrid tool-free PL
Hybrid tool-free PL bolt guide
The Shocker Hybrid bolt guides were extremely popular because they were the first tool-free guide released for the Shocker platform in 2005. Hybrid made two different versions of their Shocker bolt guide, the main difference being the size and shape of the knurled grip on the endcap area. The version with small-sized grip was used on private label Hybrid SFT's and NXT's. Originally these were available in gloss finish during the SFT era, but was later changed to dust finish to more accurately match Shocker NXT markers.
NDZ adjustable
NDZ adjustable bolt guide
The NDZ adjustable bolt guides are special components designed to allow Shockers to function better at low velocities (around 250-fps, for indoor fields in particular). The bolt guide's length can be adjusted to limit the amount of air used to fire the ball. Installation and adjustment instructions can be found here.
NDZ tool-free adjustable
NDZ tool-free adjustable bolt guide
This was the second version of New Designz' adjustable bolt guide system. This version works identical to the older adjustable bolt guide, but has a milled knob on the backside to allow tool-free removal. Installation and adjustment instructions can be found here.
NDZ tool-free ULP
NDZ tool-free ULP bolt guide
This was the third and final Shocker bolt guide to come directly from New Designz (around 2010). This bolt guide is not adjustable like the earlier versions, but instead uses a hollow bolt guide shaft to increase air volume for firing the ball. These bolt guides are one-piece components which are not adjustable. A small plug is inserted into the end which is retained with a set screw. These guides saw limited production so their numbers are low compred to the earlier NDZ bolt guides.
Pooty tool-free ULP
Pooty tool-free ULP bolt guide (picture from Pb4life21@pbnation)
Pooty tool-free ULP bolt guide (picture from pupansuds@pbnation)
Pooty's ULP bolt guides were based on the NDZ version (they were manufactured by NDZ for Pooty PB). These LP bolt guides function very similar to the NDZ version, but have a shorter knob on the back side. These bolt guides are one-piece components which are not adjustable. A small plug is inserted into the end which is retained with a set screw.
PB Metal mods modification
PB Metal Mods bolt guide (picture from J. Delaney)
PB Metal Mods bolt guide
Several custom bolt guides have been machined by PB Metal Mods' service. Two examples are shown here, highlighting different milling styles.
Nummech Lobe ULP
Nummech Lobe style LP bolt guide
Nummech's Lobe style bolt guide is 3D milled for a tool-free removal knob on the back end. This guide is meant to match just about any marker body style while still maintaining a tool-free shape for quick maintenance.
All of Nummech's bolt guides utilize the same hollowed-out ULP shaft which threads onto the endcap section and seals with an o-ring. These bolt guides are factory compatible with an optional anti-rollback screw modification when used in conjunction with an open-face bolt. Nummech's bolt guides were released in 2017 and cost $45.
Nummech Rim ULP
Nummech Rim style LP bolt guide
Nummech's Rim style bolt guide is 3D milled for a lightweight endcap design. The bolt guide was inspired by the Tremor NXT bolt guide, but uses enlarged details. The Rim bolt guides require a larger 1/4" allen key for removal.
All of Nummech's bolt guides utilize the same hollowed-out ULP shaft which threads onto the endcap section and seals with an o-ring. These bolt guides are factory compatible with an optional anti-rollback screw modification when used in conjunction with an open-face bolt. Nummech's bolt guides were released in 2017 and cost $45.
Nummech Airsmith ULP
Nummech Airsmith style LP bolt guide
Nummech Airsmith style LP bolt guide
Nummech's Airsmith style bolt guide has a 1/8"-NPT air connection which can use a minigauge if desired. The gauge will read operating pressure while the marker is idle, both on or off the field. Use teflon tape to install the gauge (because it will allow greater control over gauge depth compared to loctite). The Airsmith bolt guides originally come with a plastic 24mm gauge installation tool which allows you to easily install a minigauge without scratching the bolt guide's rear knob surface. The gauge install tool isn't required; you can use also use a pair of pliers if careful.
All of Nummech's bolt guides utilize the same hollowed-out ULP shaft which threads onto the endcap section and seals with an o-ring. These bolt guides are factory compatible with an optional anti-rollback screw modification when used in conjunction with an open-face bolt. Nummech's bolt guides were released in 2017 and cost $45.

Firing Assembly Maintenance:
The main portion of the regular maintenance schedule for the Shocker involves cleaning and lubricating the bolt and related parts. See the related links section at the bottom of the page for instructions.

Bolt Guide Bumper:
Shocker SFTs use one bumper on the bolt guide and another on the bolt itself. The bolt guide bumper is a small urethane disk placed on the base of the bolt guide's stem, which softens the bolt's rearward movement.
Bolt guide bumper disk

Bolt Bumper:
Shocker SFTs use one bumper on the bolt guide and another on the bolt itself. The bolt's bumper is positioned directly in front of the bolt's main o-ring, which softens the forward movement when firing. The bolt's forward bumper has changed over the years, so you will need to identify your bolt to ascertain which bumper is required.

Aluminum SP bolt, version-1 (grey, blue, green) - The v1 "old-style" bolts use a proprietary square urethane bumper. There is no source for these bumpers. If you need a replacement, your only option is to install a very o-ring in its place (10/70 or possibly 11/70). Do not use a larger o-ring because it will stick out too far and prevent the bolt from fitting inside the bolt sleeve.
Aluminum SP bolt version-2 (silver polished, or black) - The v2 "new-style" bolts use common 15/90 o-rings for bumpers.

Bolt bumpers for SP bolts
NDZ bolts - New Designz followed the same bumpers as found on the Smart Parts bolts, but the NDZ versions are more difficult to tell apart. The smaller bumper groove can only fit the smaller square bumper, whereas larger bumper grooves can hold a 15/90 o-ring. Newer version bolts have the ability to use two bumpers on the bolt, one on either side of the bolt sail o-ring, which can potentially replace the bolt guide bumper.
Bolt bumpers for NDZ bolts

Bolt component:
Bolt guide bumper:
Bolt bumper:
Old-style SP bolts
Old-style NDZ bolts
Bolt guide disk bumper
Square urethane disk
or 10/70 o-ring
New-style SP bolts
New-style NDZ bolts
NDZ v3m spring mod bolt
TechT Enertia bolt
Evolve ULP bolt
Pooty bolts (all versions)
Nox bolts (all versions)
Eigenbolts (all versions)
Bolt guide disk bumper
15/90 o-ring
NDZ adjustable bolt guide
Proprietary NDZ
bolt guide bumper
Evolve v1/v2 bolts
Freeflow bolts
Stock non-HE delrin bolt
no bumpers

Shocker spring mod:
A popular modification for Shockers is to outfit the bolt with a spring meant to assist the bolt's forward-motion when firing. An entire page has been created to describe the modification: Shocker bolt spring mod

Overview:
The Shocker's firing assembly consists of the bolt guide, bolt, bolt sleeve, and fire chamber. The bolt is the main moving part of a Shocker; it also acts as the valve for the marker. The bolt sleeve is what moves the bolt. The fire chamber houses pressure to fire the paintball. The bolt guide stabilizes the movement of the bolt and times the release of air to fire.
The bolt requires a proper dwell setting to fire correctly.
Solenoid inserts are used to direct air from the solenoid to the firing assembly.
Delrin bolts are no longer used, they've been replaced by more reliable aluminum versions.
There are multiple aftermarket assemblies available, although none of them are uniquelly better than all the rest.
Some aftermarket firing assemblies won't function with specific private label Shockers.

Related Links:
Stock bolt manual scan
Shocker HE Design & Theory
Shocker bolt spring mod
Firing assembly maintenance section (o-ring diagrams can be found here)
Solenoid inserts
Solenoid