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Does it say 3in. only or is it just marked 3 in. I've never run across a shotgun marked as 3" that I wasn't able to use 2 3/4" with it. What type of shotgun do you have?
I should have been clearer, sorry. The barrel is marked 3-inch will not fit on my shotgun chambered for 2-3/4". I was curious if anyone had tried to machine or alter the tang (for lack of a better word) to fit the 2-3/4"?