The GG&G AR Vertical Grip helps the user control the firearm during rapid fire and in CQB situations. The low profile ergonomic design also helps provide a more comfortable and secure grip. The AR Vertical Grip has a waterproof compartment that can fit firing pins, ejectors, extractors or other small replacement parts and Tri-grip cap designed to be opened with a gloved hand. Mounts to Mil-Spec 1913 Picatinny rails. Manufactured from solid black Acetal polymer for durability and low heat absorption. Lifetime warranty and made in the USA.