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:09, Page:007
Big Book Catalog, Issue:67, Page:009
SPECS: Aluminum, matte black anodized. .835" (21mm) OAL. 1.365" (34.6mm) O.D. Works only on guns that require no receiver extension tube.