Quote Originally Posted by seb5 View Post
I've ran them with both buffers but did notice with my 14.5 w/perm FH and mid length that the standard buffer was the way to go with commercial or even wolf ammo. With the H buffer and the aforementioned ammo it was not 100% reliable. With mil ammo it was.

I have wondered if by chopping the mid length it affected the dwell time enough to require use of the standard buffer. FWIW I use a F/A carrier

Theoretically, it could be the case; practically, I think there is too much variability between individual guns, gas port sizes, conditions of extractors/springs etc to make general guesses. My midlength 14.5 BCM upper went through 1600 rounds of Wolf and 200 rounds of S&B ammo during 2 day Magpul class with one stoppage that had nothing to do with a buffer. That rifle has a F/A carrier and H buffer.