The Carbine Length Free Float Quad Rail is a 1-piece free float handguard for the AR-15 platform. Its quad rail design offers plenty of picatinny rail to mount accessories. The T-marked rails allow accessories to be removed and replaced with ease and ensures consistent replacement. A continuous top rail provides a monolithic look with a standard flat-top receiver.The 7 inches free float quad handguard rail features a 1-piece design and will mount over low profile gas blocks. Made of black anodized aircraft grade aluminum and compatible with most carbine length direct impingement gas systems. The T-marked rails allow accessories to be removed and replaced with ease and continuous top rail provides a monolithic look with standard flat-top receivers. Features: Black anodized aircraft grade aluminum T-marked rails accepts all standard Weaver/Picatinny 1913 accessories Compatible with most carbine length direct impingement gas systems One piece design, includes barrel nut for mounting No gap for monolithic rail look Mounts over low profile gas blocks