If he is shooting out of a milspec chamber, fire away. Milspec chambers are VERY forgiving concerning brass length. They are not precision chambers by any stretch of the imagination.
Now if your buddy's chamber is something like a Wylde or Match chamber, then you are talking a different animal.
I, and several buddies of mine, have fired umpteen thousand rounds out of AR's and I guarantee you that we didn't trim each and every round.
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