Re: Which piston, LWRCI, POF, Sig556, FN 16S, ACR, LMT
I have an older LWRC M6A2 in 5.56 with over 3k down the tube. (Has the old two piece BCG.) The only failures I have had with it was a weak extractor spring and a broken firing pin when I first got it. After I got replacement parts from...