Geissele Automatics 05-283B Super MK4 M-Lok Rail AR15 Rifle Aluminum Black 9.3" The Super Modular Rail (SMR) MK4 M-LOK Are Purpose-Built And Feature Integrated M1913 Picatinny Rail sections at The Fore Of The Rail In The 3, 6 And 9 O'clock Positions. It Also features Geissele's Proprietary 2" Long Barrel Nut. Type: Railed Forend Firearm Type: Rifle Firearm Model: AR-15 Material: Aluminum Finish: Black Rails: Picatinny
