During my recent trips to the range, the Mac 11 started having issues with the fire control group. Initially, we had binary firing, but as I tested more and swapped fire control groups, the issue just got worse. Eventually, we had a completely dead trigger, and upon closer inspection it seemed our trigger and hammer pin holes had deformed and "walked" away from each other.
And, before I forget, these failures did occur after firing +p+ (which kicked HARD in this design. There's a not insignificant chance that PETG frames will work A Okay with non +p and +p+ rounds. But regardless, I chose to print a new frame out of PLA which we will subject to the same testing conditions, including +P+ rounds and we'll see if it fares any better.
Given the properties of PLA vs PETG and the testing done by others in the beta, I suspect that it'll be just fine, but AFAIK nobody has pushed this design to large round counts yet (another reason it's still beta). If this frame works, I hope to get to 1K rounds soon on this build and as always I'll keep you guys posted on the progress!