Machined aluminum plug screws into the lower receiver to seal off the extension tube opening on AR-style pistols in .22 LR rimfire. Black anodized plug accepts a pushbutton quick-release sling swivel (not included), and requires no fitting or modification to the gun.
AR-15, Issue:11, Page:009
Big Book Catalog, Issue:68, Page:010
SPECS: Aluminum, matte black anodized. .835" (21mm) OAL. 1.365" (34.6mm) O.D. Works only on guns that require no receiver extension tube.