Can someone tell me possible causes for a double feed? Didn't see anything in the -23&P. It only happens in full auto and seems to be isolated to one mag, but that mag has seen LOTS of semi-auto use is a variety of guns with no issues.
The empty case extracts and ejects, then the bolt picks up two live rounds and tries to jam them into the chamber at the same time. It happens maybe once every 2nd or 3rd mag.
The mag in question is USGI w/ green follower. I've probably replaced the spring too, though I can't be sure. Welds are solid and feed lips are straight. I've never had a round pop out the top when it wasn't supposed to.
Ammo is XM193.
Sendra lower w/ Bushmaster M4 upper.
I'm leaning toward a mag issue, but wanted to know if this might be an indication of a problem with the gun itself.
Thanks,
SC