The B&T NAR (NATO Accessory Rail) Mount is an add-on adaptor that allows the HK MP5 STANAG Claw Mount to accept Picatinny rail mounted optics. Constructed of strong, lightweight aluminum, the B&T NAR Mount attaches quickly and easily to your STANAG mount via two screws. Ten slots on the B&T NAR Mount gives you plenty of room to adjust optic position for correct eye relief. Includes Picatinny rail, screws and Allen wrench Mil-spec hard-coat anodized 5.44" OAL With so many advanced sighting systems available, the B&T NAR Mount for the HK MP5 STANAG Claw makes a great interface adapter for scopes, holographic sights and even night vision sights. Mfg: B&T Usa