DealAR-15 Stripped Lower and Upper Receiver Combo. MARKED .223-5.56MM. The Tactical Machining AR-15 lower receiver is built from 7075-T6 forgings from the lead forge in the United States. The contour is fully machined leaving no flash marks from the forging and we take extra care when machining our lower receivers resulting in tolerances that are tighter and fits that are better than other lower receivers. We adhere to mil-spec tolerances to ensure that our lower receiver remains compatible with any quality aftermarket parts you can find. from Tactical Machining (Product BRBS03) |