This tactical short 3.25" stubby AR-15 vertical fore-grip provides the user with several important advantages from 123A battery storage compartment to being compatible with any weaver/picatinny 1913 rails. This stubby vertcal fore grip helps diminishing muzzle climb during burst-fire sequences to simply offering a more comfortable compact shooting stance. Black Polymer. Specs Storage capacity for (1) 123A battery Fits Weaver/Picatinny 1913 rails Length 3.25" Black Polymer Note: Can be used with just about any AR15, M16, M4 and AK47 rifles with weaver/picatinny 1913 rails and handguards.