I have been reading quite a few threads concerning AR's.. Comparing this brand against another etc.. The local shop has a Bushmaster with the "piston" configuration.. Any feedback on this style of AR ?? Oh, and do not get "permanently partially disabled" in Wa. State while on the job ! You would be insulted by the settlement.. Meanwhile, my smashed kneecap is healing but arthritis is taking over now. The State does not give a darn for arthritis for the next 30 years.. OK, enough whine. Time to get some cheese..