Very innovative in my opinion. I want bad bad. Addresses nearly all the engineering issues I've been able to find with 9mm Glock mag ARs. Only thing I'm not sure about yet is a view of the barrel extension, the shape of the feed area and whether the top right lug area is blocked out. If they've taken care of that then this looks like a dream.

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https://www.cmmginc.com/product-cate...-guard-rifles/