80 Percent 1911 Frames are CNC machined from an investment casting of 4140 ordnance grade steel. Index finger/thumb rest grip. The operations left to be completed are slide rails, hammer and sear pin holes, and barrel seat. This is a not an FFL item. This is not a complete frame and still requires machining to be done.
100% Heat Treated Steel Frame NOT Spot heat treated, To Exceed U.S. GI Mil-Spec.