MFR Handguards take advantage of the M-LOK attachment system for superior cooling, ergonomics, and modularity without sacrificing strength and durability. Attach your favorite optics and accessories using the uninterrupted 1913 Picatinny top rail and M-LOK attachment points found along 7 positions of the rail. A standard AR-15 barrel nut is used in mounting the MFR with a bolt-up system that offers increased strength and reduced overall diameter.