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The 870 has a matte finish. The Wingmaster has a polished blued finish. Wingmaster internal components are high quality and milled, not stamped or mold injected. Internals are polished and much smoother performing than an 870. So with that, I don't see there being a fitment issue.

Hi Leo and welcome. The barrel ug should be the same but I would confirm with Mossberg Customer Service to be sure at 1 (800) 363-3555 - Cheers and stay safe!

I am going to give a qualified yes 99% it will not fit a 3.5 inch receiver.