I built a new AR using a PSA lower, PSA LPK, and an upper custom built by a friend who is a Class III manufacturer. It has a chromed bolt of unknown origin, but appears extremely high quality. After assembly, I tend to run the gun a little on the wet side of normal for the first few hundred rounds to make sure nothing is damaged getting broken in. However, for the first time in several builds, this gun fired one round, unlocked out of battery, but the bolt only recoiled a very minor amount, maybe a quarter of an inch. A few taps with a punch and gunsmithing hammer backed the bolt out and extracted the round. Inspection shows nothing broken or galled, so I'm not sure what happened. Has anyone else experienced a condition like this before? If so, what did you do? I know a gunsmith should inspect it but I wanted to find out the cause first, if possible.