So a friend on the forum brings in a BM Carbon 15 (that is owned by a friend of his) for a new gas tube. The top of the GT (closest to the top of the charging handle) is smashed and crimped downward. I looked at it and was like how Da F*Q did that happen??
So as I push out the roll pin on the GT and look at the the GT hole in the upper receiver. It is pushed all the way to the side (touching the wall). Hmm, that's interesting. I wonder if the FSB wasn't installed straight (canted) and is causing it. So I pull the upper out of the vice and look at it. Sure enough, the the FSB is canted. Ugh.
I remove the GT and then remove the barrel nut. As I am turning the barrel nut, I feel the entire barrel turn slightly. After removing the barrel nut, I see that the alignment pin in the barrel extension had pushed its way through the plastic of the upper receiver during installation (most likely from over tightening). Double Ugh.
The best part is the owners contacted BM for help and they blew them off.
Did I mention that I love working on BM's.
C4



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