need help with getting a kg99 to work. The back frame was cracked but I used some jb weld to get it back on and i feel good about how it came out. Now I’m missing the rear cap and the recoil buffer but I was just going to go to Home Depot and make a buffer myself. The issue I’m having now is finding a rear cap or a substitute for it. Anyone have any ideas? Should I try to find a similar cap at a hard ware store or just go without one?