Quote Originally Posted by markm View Post
Least failing?? What's that mean. Any AR should run almost all ammo reliably.
Sorry, it's been a while as other things take up my day. Everything I've read claims that an SBR when suppressed is highly picky about what ammo runs well. My son just finished a 6" 300BO with a big can. The only thing it will run well is AE 220gr. He just picked up a set of light weight buffer https://www.midwayusa.com/product/1020899941 to help try to run other ammo. His gas port is fixed size as he only wants to run sub-sonic ammo but some of the high $$ stuff would not lock back.

I may just buy only the low power .223 for practice. So far, it does not jam.