Designed for AR-15/M4 rifles equipped with a collapsible stock, both MIL-spec and commercial, this adapter provides ambidextrous mounting points for STORM Slings™. • For use with AR-15/M4 rifles equipped with collapsible stock• Provides ambidextrous mounting points for STORM Slings™ (sold separately)• Simple add-on installation with no modification required• Fits MIL-spec or commercial tubes