For ages people have speculated about installing LPRs on Shockers. I had seen it once before at a Big Game event. Eventually I decided I wanted to perform this extremely rare modification, and this page describes what I did.
The goal of this mod if to allow the Shocker's bolt (4000 solenoid) to function off LP air supply. Even though the marker uses dual solenoids, the other solenoid can't be dropped using an LPR due to how it interacts with the rest of the marker. Because of this, the mod requires altering sections of the marker while preserving other sections to operate like stock.
There are many ways to get it done, but I decided the best way was to fabricate an "insert" that would divide up different sections of the Shocker's air distribution manifold chamber. The insert would separate the front and rear of the maniold and allow those parts to be 160-200 psi valve pressure like normal. The space inside the insert would hold lower-pressure air that will feed the bolt solenoid. The way I planned it was to stick the LPR out the back of the gun and use microline to connect to the middle of the insert, supplying it with the LP air.
I sketched a few ideas on CAD and ended up narrowing it down to this basic shape, which is shown here with a "cutaway" view of the air manifold...
The next step was figuring out how to hold the insert in position. What I did was drill two holes into the side of the manifold, into which screws will be threaded and sealed. These screws will intrude into the manifold and prevent the insert from being pushed in either direction.
The screws will be sealed so air won't leak out. I just elected to use regular button-head screws with o-rings under the head to seal. This next rendering shows the position of the insert and what it does:
The next step is to equalize the pressure on both ends of the manifold chamber (which has been cut in half by the LPR insert in the middle). I drilled two new ports into the side of the manifold then tapped them to accept regular air fittings. On the outside of the body, the two air fittings will be connected by LP hose. This allows both ends of the manifold to supply air to one-another, bypassing the blockage in the middle. Approximate hole placement seen here:
After this, a third port was drilled into the body so it would open up the space in the middle of the insert. This port was similarilly threaded and will connect to the LPR output via air fitting and LP hose. After this, the only other thing to do is install the LPR, screws, and other parts, and the mod is complete.
This is what the LPR insert actualy looks like. I ended up making it out of delrin since I had a lot of delrin lying around without a use.
After following the descriptions from above, the final product looked like this:
The modification works flawlessly and I believe the above plan is the easiest method to follow in terms of simplicity and fabrication of new parts. Suggested operating pressure is as high as recommended (200-psi) whilst the bolt's pressure is dropped to about 150 psi. I found dropoff when I decreased it further.
I ended up converting the gun pictured above to my redesigned Shocker Sport "Spectre" mod, so I no longer have access to a marker with the working mod installed. I will probably do this to another marker of mine for the sake of it.