AR-15 sheet metal and tube steel upper receiver

AR-15 sheet metal and tube steel upper receiver

grabcad

An innovative upper receiver concept is presented here. The design comprises an inner 1.25" tube steel and an outer sheet metal component that are either welded or riveted together. This construction reduces wear and friction caused by the bolt carrier while allowing dirt, debris, and fouling to be expelled from the action, preventing any hindrance when dirty.

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