Well, this is my newest...Custom? o_O...not realy sure if i should call it that actually. Its just a system x bas with some chops. It has been shortened 1" off the rear of the gun, I've cut way the top tube till about 3/4" from the air port, the fronts been cut down to nearly the valve air chamber. The coolest thing is the backs been trimmed down till you can see into the bottom tube of the gun, i get a kick watching the hammer go back and forth lol.
it was a home project, done with house hold tools, hack saw, dremel, sand paper, and files. Only power tools were a chop saw and table top sander. Thus its a bit rough, and befitting a super low budget, spare parts job it got a rattle can out fit.