Cracked AR Bolt

Second this. I will only use BCM or LMT for BCG and they have always been bulletproof for me.
This was not my mainstay AR. I got this one years ago on trade for a SP2022 I wasn’t using.
 
speaking of AR bolts, guy comes into the shop a few days ago with a busted upper and a bcg stuck into battery. first question i ask after seeing the barrel marked 5.56 NATO was whether or not he also owned a .300blk.

2 guesses as to what happened...
 
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