I was at the range awhile back & a m-4 sbr was being fired with constant failures to eject on the 1st round. it would extract but then not eject(still holding the empty) move forward & jam up on a partially stripped fresh round, denting it.
no one could figure it out, I thought  the gas system might be misaligned over the gas port.
is this typical of the ar-15 sbr's.?
I was thinking of getting one but after seeing the problems with this one , makes me stop & think.
thanks for any input,
ck

What type of ammo? My 10.5" AR did the exact thing with Wolf ammo. I put the BCM extractor upgrade kit in it and the problems went away.

ETA- Does it work okay after clearing the first malfunction? My would do this at random times, not just on the first round.

dupe post