FAB Defense TAL 4 Tactical Vertical Foregrip - Black - The TAL-4 Tactical Vertical Foregrip is designed to provide improved hold on your weapon and more comfortable use of pressure activated devices with the dual sided optional slots. Features Quality non-slip design; Double side pressure switch housing; Water proof anti rattle storage compartment for two CR123 or AA batteries; Both quick release mechanism and a secure bolt locking system; Designed to fit on all 1913 Picatinny rails; Durable & Lightweight fiberglass reinforced polymer construction; User installed-no modification or gunsmith required; Available in black, olive drab green or desert tan;