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Has anyone here experienced, or observed damage to the face of the buffer from contacting the buffer retainer pin?
Posting this because I have seen this occur on two AR's that were built on the same brand OLL lowers. Both rifles experienced cycling problems until they would no longer function. When disassembled the buffers were stuck in the buffer tubes and had to be forced out from the rear of the tube.
We determined that the hole for the buffer retainer was drilled too far toward the buffer tube by approximately .050 and the rear of the bolt was not in contact with the buffer when the upper and lower were assembled. This allowed the buffer to contact the small pin each time the action cycled, which gradually chewed up the outside edges. On one rifle, the pin was bent and almost broken off.
Posting this because I have seen this occur on two AR's that were built on the same brand OLL lowers. Both rifles experienced cycling problems until they would no longer function. When disassembled the buffers were stuck in the buffer tubes and had to be forced out from the rear of the tube.
We determined that the hole for the buffer retainer was drilled too far toward the buffer tube by approximately .050 and the rear of the bolt was not in contact with the buffer when the upper and lower were assembled. This allowed the buffer to contact the small pin each time the action cycled, which gradually chewed up the outside edges. On one rifle, the pin was bent and almost broken off.
Reason I ask, I was at an appleseed shoot a few years ago and this one couple was shooting some DPMS rifles when the wifes completely jammed up, we finally managed to get it apart and the bolt retainer had broken free and it and its spring had jammed everything up. I let her borrow my lower so she could continue shooting and when I got it back the marks on my buffer from the retaining pin were way more severe than from me shooting my own upper. Maybe the DPMS BCGs are slightly shorter than others, I don't know, it was odd though.
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