Just saw this thread on AR15.com forum the other day. Basically he "shot out" the barrel at 11,000 rounds. A PSA nitride 10.5 barrel. Started to keyhole heavier rounds at 11,000 round count. Still shooting 55gr fine though. To me for the money, unless for military, contract, or LEO service (and maybe even then)it seems like the PSA stuff is just fine.

https://www.ar15.com/forums/AR-15/A-...ds/122-782686/