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. After the machining process is complete the lowers are checked for quality and shipped off to our finishing facility for type III hard coat anodizing. Note: These are considered a firearm and are required by federal law to be shipped to an Federal Firearm License (FFL) holder near you. If you require help finding an FFL holder please do not hesitate to contact us.