I failed to mention I have an adjustable gas key, but so far haven't adjusting it to see if the pressure being generated is sufficient to properly work the action. I didn't entertain the idea of replacing the gas block on the Bushmaster upper, but due to the level of effort required to replace it I decided against it. I'm not lazy, I'm just not a gun smith. The Sun Devil gas key works extremely well and I highly recommend it. During the next couple of outings I'll see if I can adjust the gas flow to the point where the action fully cycles with either my current load or a slightly heavier charge of Trail Boss. If not, and I want to continue using the load, I'll have to manually cycle the action after each shot, which doesn't bother me in the least bit. I'll call it my straight pull bolt action AR load.