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Purchased this gun from a local online auction where they called it a Rolling Block (16 gauge?). I can say that 16 gauge shells do not fit in the gun. It has a round barrel that is 30 1/2" long overall gun length is 48". The inlay is flush and I'll assume was not factory. But help on whom might have ...

This gun was purchased at an auction and was called a 16 gauge rolling block. Any help in identifying what it really is would be appreciated! The barrel is round 30 1/2" I think it is a 22 stamped on top of barrel. The inlay is flush and I am guessing was custom, but do not know if it was factory or ...