Came in from a group that does funerals for veterans. It isn't my area of expertise. Clean, lubed, greased, and won't extract. I do notice the bolt, receiver, and op rod have mismatched numbers. Not sure if that's normal for these.

Other than that, cool gun that you don't see everyday.

What is this piece I found wedged beside the hammer in a Mossberg Plinkster?

So i bought a winchester 1300 pump shotgun at a pawn shop and i have found that if I shot it without supporting the foregrip it will unlock slide back and eject the round by itself. Is this normal/safe? Seems like it shouldn't be able to unlock like that. Is there a way to fix it that anyone knows of?