I don't know how useful anyone will find this, because it requires a pretty specific set of circumstance, but hell you never know. Figured I'd document it. The goal was to replace the solid (static) resin GL from my pulse build with something more accurate and fun (HCG grenade launcher [thanks Matsuo!]), and to do it with as little cutting as possible.
It all comes apart very easily. Didn't even need heat for the glue to give out. Naturally the first problem is all the moving parts mean I couldn't simply bolt it on like the old one (at least not with 3.5" bolts).
I decided to use smaller bolts mounted from the inside.
1. First, had to match up the holes so the new bolts will screw into the same spots as the old ones on the Thompson.
Carefully Drilling while comparing directly to the old one took care of that step.
2. Making room for the new bolts is the key to it all. The silver block has a black...block (sorry gun-guys, I dont know the correct terminology). Both those need a "pass through" trimmed into them so they dont slam the new bolt heads when sliding.
I actually had to trim the black bit down even further than seen here. (I tried removing it entirely, but the action felt really hollow without it. So I put it back and trimmed it more heavily.)
3. The inside surface is concave, so you cant use too big a washer without heavy cutting (which I wanted to avoid)
take note of the cut bolt in that pick in the red circle. That will be the 'stud' for the front.
4. Attaching the front stud (that passes through the barrel vent) is done by wedging a nut on top of the GL 'barrel' and using the cut bit seen above.
5. While it was open, i spring loaded the trigger. Just drilled about a 1/4" deep into the area in front of the trigger and inserted a spring from a pen. I cut a notch on the top of the trigger so the spring wouldnt slip when I wedged it in. So far so good.
6. Last step is cleanup. One HGC planned hole ended up visible so i filled it with bondo and painted it. I did NOT glue it back down. I wanted to to stay accessible "just in case". When the vent, shroud, and fore-grip were attached, it 'friction fit' pretty well. But I also drilled out the back and inserted a screw into an existing recessed area to hold the back closed tight.
Thats it. Im quite pleased with the improvement. Hopefully it holds up!!!
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