I think that probably is a short chambered gun, probably a St. Louis one. I had one, it is not a sweet 16 I am guessing, but can be altered to accept regular 2 3/4" shells. I really didn't like the safety location at the front of the trigger guard, but I learned to shoot with it and it was all I had at the time. It's an OK gun but the ones made after that were better.

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