USED FN America AR-15 Hammer Forged 16 Inch Barrel Carbine Length Gas System 5.56mm NATO EDEMO1 Condition Parts Only/Salvage Defective. Hammer forged from proprietary Chrome Moly Venadium (CMV) steel. This is the same steel developed for our Machine Gun barrels designed to handle the punishment of full-auto fire now available to you in our AR-15 barrels. Magnetic Particle (MP) tested to ensure each barrel is free of microstresses and/or cracks. Government Profile built for .750 inch diameter gas block x 28 inch threaded muzzle. M4-style feed ramp and barrel extension for consistent and reliable feeding. Manganese Phosphate barrel finish. 1:7 inch right hand twist rate. Specifications for FNH USA AR-15 Hammer Forged 16 Inch Barrel Carbine Length Gas System 5.56mm NATO 36421: Mfg Item Num: 36421 Type: BARRELS - RIFLE Barrel Length: 16 Caliber: 5.56mm NATO Caliber-Gauge: .223 REM. Model Header: Carbine Length Gas System Master Model Header: AR-15 Hammer Forged Barrels The FN America AR-15 Hammer Forged 16 Inch Barrel Carbine Length Gas System 5.56mm NATO 36421 is a quality addition to the FN America lineup. For more great deals on AR15 Barrels by FN America please browse our FNH USA Gun Parts page. FN America 36421-EDEMO1: FN America AR-15 Hammer Forged 16 Inch Barrel Carbine Length Gas System 5.56mm NATO EDEMO1 Condition Fair Defective