I only have opinions, I have only shot at paper and never been shot back at. I am glad for that and appreciate, to no end, those that do/did. With that being said, I have not had a single failure, while only shooting at paper mind that, with any of the ARs I got, from DPMS, to frankenbuilds, BCM, DD, Spikes, and LWRC piston(which I prefer because of the less amount of cleaning I gotta do but annoyed by “ping”). Just my opinion from someone that only shoots at paperKinda disappointed honestly. Some decent opinions though, not a lot of scientific stuff or real life experience it feels though. I need to read through and catch up though.