The Aim Sports Modern Sporting Rifle AR Grip includes a removable fin and backstrap. This grip comes complete with steel AR grip screw, washer and roll pin, and is made of glass reinforced high composite polymer and a modern ergonomic design.The Aim Sports modern sporting rifle AR grip includes a removable fin and backstrap. Complete with steel AR grip screw, washer and roll pin for permanent attachment. Made of glass reinforced high composite polymer and a modern ergonomic design. This product has not been approved for legal compliance by any state or local firearms regulatory authority. please consult with a competent firearms attorney before attempting to make your rifle compliant with state or local assault weapons ban laws. Features: Designed specifically for California featureless AR rifle configuration Removable backstrap/backfin and with roll pin for permanent application Steep angled design with care attention to ergonomics High density, durable, lightweight polymer construction with subtle texturing on the sides, with front and back serrations Molded shelf to fill space between fingers and trigger guard Increased comfort for web of hand Hollow interior uses short AR grip screw