The AR-15 grip attaches to the lower receiver and gives the shooter a secure hold on the rifle. It connects to the pistol grip screw and nut at the bottom of the lower receiver. Shooters choose between different grip angles, textures, and profiles to suit their stance and hand size. Standard A2 grips and ergonomic aftermarket options both fit mil-spec lower receivers. Some grips include a storage compartment for batteries or cleaning supplies. Builders select one based on comfort, control, and compatibility with their lower parts kit.