Quote Originally Posted by Peter Laidlericon View Post
The pistons were shimmed in order to achieve the correct amount of articulation. That is, when the piston and piston extension is inserted into the gun the piston MUST enter the conical entrance to the gas cylinder without assistance and not foul on any part of the surrounding area or the rear of the cylinder

How do I still remember this crap? Must be from when I did one!!!!!
Where did the shims come from? I have been unable to find a part listing for them. Were they steel?