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Old October 26, 2012, 08:46 AM   #8
Nathan
Senior Member
 
Join Date: July 1, 2001
Posts: 6,334
Quote:
I agree with this but for different reasons. One of the biggest reasons AR's "KABOOM" is improper head space. If you don't have the gauges to properly headspace the barrel; I highly recommend just buying a barreled upper.
Simple question for you. . .When/Who headspaces and AR assembly?

ANSWER: The guy who puts the barrel extension on.

Since 99% of people building an AR are not putting the extension on, the headspace is a matter of how well was your bolt machined. Surely there are bad ones, but I think they are rare. Surely, some combinations of bolts and barrels are NG.

If you want, a headspace gage is a good spend.

Last, I cannot imagine an AR which is soooooo out of spec to KABOOM built from basically good parts. It may not close reliably or stretch the headspace datum line .01" too far. Some quick case measurements would tell you that you are NG.

I would bet most KABOOMS are related to bad bolt material or super bad extension mounting.
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