BARREL AR-15 5.56MM 14.5" CARBINE LENGTH GAS SYSTEM Manufacturer Model Number: 36420 Manufacturer: FN Model: Hammer-Forged Barrel Caliber: 223 Rem | 5.56 NATO Type: Accessory-Barrels Item Type: Accessory Shipping Weight: 1.95 Feature: Chrome Lined Chamber and Bore Feature: Mil-Spec Barrel Steel Feature: Carbine Length Gas System Optic Adjustable Objective: false Optic Reticle Illuminated: false