RE: pump shotgun
most every 870 and mossberg ive ever fired does that...especially with heavy loads...
like the others said, no saftey issue....but when you cycle the action, do it like you mean it. once you short stroke one and need that 2nd shell and its not there, you'll learn to work that action harder...
been there done that...thankfully i still ended up taking the turkey home...would have been home an hour earlier if i would had that 2nd shell in though....that click was a sickening sound when you got a wounded turkey that comes back to life and can run at full speed...