The Carbine length Bravo Company Manufacturing PMCR (Polymer M-LOK Compatible Rail) is a drop in solution for rifles without free-float handguard systems that are using delta-ring systems. This M-LOK rail features textured areas for better handling and ergonomics. With an aluminum heat shield and tough, heat resistant polymer material, the PMCR Handguard will stand up to heavy volume shooting. The multiple M-LOK slots offer mounting options at the 10:30, 1:30, and 6:00 o' clock positions so that you can find the perfect position for your accessories. If you're building an M4 style carbine or want to ditch the clam-shell that came with your AR-15 then the BCMGUNFIGHTER PMCR (Polymer M-LOKA(R) Compatible Rail) is fast and easy way to improve your rifle. Manufacturers note: PMCR Carbine will only fit round end caps. Features:Carbine LengthM-LOK MountingDrop-In Textured Grip PanelsAluminum Heat Shield High Strength, Heat Resistant Polymer Expect nothing less than professional grade manufacturing from Bravo Company USA, holding one of the nation's largest stocking inventories of AR-15, M4, and M16 parts and accessories.