These drop-in, mil-spec polymer handguards for the AR15/M4 are perfect for that USGI look. They offer aluminum heat shields on both the upper and lower halves, providing heat protection for your hands. The Mid Length handguard includes aluminum heat shields for increased protection. These handguards fit between the original Delta Ring barrel nut and the round handguard cap (also fits triangular cap).Features: Make: AR-15/M4, M16 Color: Black Length: 6.5? (Carbine), 8" (Mid-Length), 12" (Rifle) Material: Polymer Made in the USA