The New FAB Defense NFR Aluminum Quad Rail System provides you with a carbine length M4 handguard upgrade enhancing your weapon's overall tactical performance, ventilation and versatility. Features: Four 1913 MIL-STD Picatinny rails for versatile mounting solutions Precision machined from 6061 T6 Billet aluminum for maximum durability Rugged construction will not bend or deform under any condition Field tested under extreme conditions for maximum performance and durability Integrated ambidextrous QD front and rear sling swivel connectors Hard coat anodized for optimal wear resistance Replace your standard handguard, simple installation, secured by 4 bolts Rail system firmly locks to the barrel nut and front handguard cap Perfect alignment with the receiver, secured with anti-rotation locking tabs No gunsmith required   Palmetto State Armory is your top choice for tactical accessories and gear from Fab Defense and other top manufacturers!