"NEW M-LOK Handguards for the AR15/M4 Platforms Easy Drop-In install, no special gunsmithing involved, fit into Delta Ring and front Handguard Cap. Remove factory handguard, drop in the M-LOK handguards and use supplied screws to secure M-LOK handguard in place Solid fit, top rail is at receiver height and extends over Delta ring to the endge of the receiver. Handguard has 7 angle surfaces of M-LOK slots Black Anodized Aluminum Construction This model fits: Carbine Length Gas Systems Includes two Accessory M-LOK to Picatinny Rail Sections. One Short (1 1/2 M-LOK slots/ 5 slot Picatinny) and one Medium Length (2 1/2 M-LOK slots/ 9 slot Picatinny) Picatinny Rail sections. They can be placed in any of the 7 angled M-LOK surfaces Designed to fit AR15/M4s with: MIL-SPEC Barrel Nut, Delta Ring and front Handguard Cap U.S PATENT PENDIN"