Spikes Tactical M-LOK 9in Handguard Rail - The Spike's Tactical MLOK rail system is a lightweight 1-piece quad rail. Sharing many of the same characteristics of the appealing Spike's SAR3 rail, the MLOK rail is even lighter. Each component is manufactured to precise tolerances for a firm fit and reliable service. 1 Piece Free Float Design 6061-T6 Aluminum Rail 7075-T6 Aluminum Barrel Nut Black Type III Hardcoat Anodized Built In Anti-Rotation Tabs M-LOK Slots Excellent Heat Ventilation Scalloped Rails 6 Built In Q.D. Sockets (Sling Attachment Points) Continuous Top Rail Compatible With Many Low profile Gas Blocks Barrel Nut Works With Standard USGI 3 Pin Barrel Nut Wrench Height 2.2in, Width 2in, I.D. 1.5in Includes (1) 9in M-LOK rail, (3) Black Ergo 4 slot covers, (1) Barrel Nut, (1) Heavy Duty Q.D. Sling Loop, (6) Barrel Nut Shims, (One .025in, One .0125in, Two .003in, And Two .0015in), (6) Grade 8 T-20 Torx Screws, (2) 3/32in Allen Head Screws (Install on Top of Rail Only), (1) Tube of Blue Loctite, (1) T-20 Torx Wrench, (1) Instruction Sheet, And (1) Spike's Tactical Lifetime Warranty