The BLACKHAWK! AR-15 Storm Sling Adapter is what you need for your rifle. This adaptor gives you ambidextrous mounting points, and no modifications are required. It is designed to fit MIl-Spec or commercial buffer tubes, and comes in a black finish.
Features and Specifications:
Provides ambidextrous mounting points
Simple add-on installation with no modification required
Fits MIL-spec or commercial tubes
AR-15/M4 rifles equipped with collapsible stock