This is a precision manufactured, heat treated slide stop, is completely interchangeable with Colt or Military parts without fitting. Perfect for building up a frame kit. For all .45 ACP. Available in Glass Bead Blue Steel or Glass Bead Stainless Steel. These 1911 parts meet or exceed original factory specifications. If you're building a gun, or wish to bring your 1911 back to true mil-spec, these parts will provide exceptional service. May require fitting to specific gun. WS102