BBL AR-15 5.56MM 14.7" M16 MID MIDLENGTH GAS SYSTEM Manufacturer Model Number: 20-100038 Manufacturer: FN Model: AR-15 Button Rifled Barrel Caliber: 223 Rem | 5.56 NATO Type: Accessory-Barrels Item Type: Accessory Finish: Manganese Phosphate Finish Shipping Weight: 1.85 Feature: Chrome Lined Chamber and Bore Feature: M4 Style Feed Ramps Feature: Midlength Gas System Optic Adjustable Objective: false Optic Reticle Illuminated: false