I'm on I'd say my 8-9 crate of 1600rnds of 5.56 norc. I swear to god I haven't had one light pstrike, every failure I've had has been to do with mag issues or me screwing around with gas settings. This ammo feeds perfect in my xcr-l, tar-21,acr, norkM4, and type97. I honestly couldn't comment on groupings I'm sure it's not as good as American eagle stuff, but it bangs steel pretty decent at 50ft haha