NBS 9MM Colt Magazine Magwell Adapter for AR-15

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 openSteel feed rampsInstalls from the bottom of the magwell with top and bottom locking Screws/li>No dissassembly of the bolt catch requiredFits Colt SMG and Uzi Style MagsT-6061 black anodized aluminum bodySteel feed ramp and ejectorNet weight: 4.3 ozInstallation:Remove screw and washer that is pre-installed next to the ejectorFeed the magwell like a regular magazine into the mag wellAfter locking into the lower, re-install the washer and screwThen use the provided Screws(2) and hex key to set the block into place from the bottom