Mossberg 500 not wanting to pump
I've had this happen a few times with my 500. It's a 1996 manufacture. I bought it used. Had it happen on the cheap bulk stuff, not sure what brand, and had to do the butt on ground 2 hand pump as well. Also had it happen to me recently when I put a new stock on it. I was cycling the action to verify unloaded status, and it locked on empty chamber. Have to detail strip it and give it a good cleaning and lube.