This tactical vertical foregrip for AR-15 rifles is ergonomic with finger grooves and will mount to most 1913 MIL-STD picatinny rails and Weaver style rails. The vertical foregrip is constructed of heavy-duty polymer. It is the ideal grip for CQB and enhances overall weapon control in rapid fire. Easy to install. Slide the grip onto the rail and tighten the two allen bolts.