Is it possible for 870 Wingmasters to have mim parts?

[Robert]

I recently started having some extraction issues with my 2011 production 870 Wingmaster. I’m pretty damn sure it has at least an mim extractor (idk how). Judging by the rem870.com article on mim vs non-mim extractors, mine has the same ridge and circle marks as the mim extractors despite being a Wingmaster model. Is this possible? I’m so confused😐

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