Low profile Free Float Handguard Quadrirail for AR15 made of anodized aircraft aluminum. Available in multiple lengths.Features:• Black anodized aircraft aluminum.• T-marked rails. Accepts all standard Weaver/Picatinny 1913 accessories.• Compatible with most direct impingement gas systems.• One-piece design, includes barrel nut for mounting.• No gaps for a monolithic rail appearance.• Mounts to low profile gas blocks.Dimensions:MT060 - 7.2"/18cmMT061 - 9.2"/23cmMT062 - 11.75"/29cm