The NFR aluminum quad rail system provides you with a carbine length handguard upgrade enhancing your weapon's overall tactical performance, ventilation and versatility. Precision machined from 6061 T6 billet aluminum, the NFR features four 1913 MIL-STD Picatinny rails, integrated ambidextrous QD front and rear sling swivel connectors, and is secured with anti-rotation locking tabs.The rail system firmly locks to the barrel nut and front handguard cap. It is compatible with carbine length M16 models and variants without a gas block. This model has a black hardcoat anodized finish.