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It is literally the same frame. Only difference is the ejector and ejector spring. You can often replace the ejector spring and relieve the ejector with a dremel without replacing the rivets and shoot 3". Once you know what you're doing it's about a 20 minute job or less
I was curious about this as well. So my 2 3/4" Wingmaster could be made to shoot 3" shells. Assuming I had a compatible barrel and did the ejector work.