I just got done reading the Individual Carbine Competition thread. Someone mentioned that most of them looked like the M-4 with a piston system. I was at the range last week with my A2 and someone made a nasty remark about coming into the 21st century and getting a piston system based AR. Meanwhile my toy is spitting lead like there's no tomorrow and his M-4 wonder machine can't get through a single mag without a failure-to-do-something. Also the accuracy on mine is right on. At fifty yards my target is 12 one inch squares on a sheet, 4 sheets on the target frame. 48 targets, 48 shots, no misses.
My question is what the heck is this piston crap and why do I need it. Remember to talk slow. I'm old and I'm used to Major Calibre toys.