The Sons of Liberty Gun Works AR-15 Upper receivers are built from mil-spec 7075-T6 forgings from the lead forge in the U.S. The contour is fully machined leaving no flash marks from the forging. SOLGW takes extra care when machining their upper receivers, resulting in tolerances that are tighter and fits that are better than other upper receivers.
The Sons of Liberty Gun Works stripped upper receivers are made to the tightest tolerances while still being compatible with Mil-Spec parts and upper receivers. This ensures that there is absolutely no wobble between receivers which can affect accuracy. These stripped AR-15 upper receivers are a great starting point for your next build.