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 . Features 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