Aggressive design, ultra light 5.5″ free float hand guard. Their unique design features a very slim profile (1.375″ ID) that still allows for the installation of a sound suppressor of 1.40″ in diameter and smaller to tuck inside of the handguard when used with an exact length 6″ barrel. Works with 223/5.56 and 9mm calibers. Handguard does not require timing and installs with a standard wrench.