Molded, polymer, vertical grip attaches to Picatinny and Weaver-style accessory rails on your AR-15 hand guard for superior control and improved weapon retention. Grooved, grip area ensures positive, non-slip hold in all tactical situations. Reduces fatigue and improves muzzle control in close quarters. Threaded shaft, with tightening knob, locks grip to rail, plus, makes removal fast and easy when shooting from a bench or bipod. Rubber O-ring prevents accidental loosening.