It was the brass catcher that caused your bolt to break. I have seen it happen before on an AR-10(308).
No...It was not the brass catcher. Had you read the entire thread you'd have seen that the catcher I was using was not attached to the rifle. It was resting on the bench a good 18 inches from the rifle. There is no way a case bounced back into the action.
If there is ever a zombie outbreak, I get Mike on my team...
No argument here, there are some guys you just gotta pick first for your team.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek