Description 9mm AR-15 Mag Well Adaptor for Colt style magazines. This USA Made adapter allows for easy conversion from any standard .223/5.56 lower receiver to 9mm.  The easy drop in design installs in minutes, with no gunsmithing or permanent modifications needed to the lower receiver. Key features are: - Last round bolt hold open - Steel feed ramps - Installs from the bottom of the magwell with top and bottom locking Screws/li> - No dissassembly of the bolt catch required - Fits Colt SMG and Uzi Style Mags - T-6061 black anodized aluminum body - Steel feed ramp and ejector