AT3 Tactical 7.62x39 Medium Profile 16 Inch AR-15 Barrel Black. 6239 Barrel makes a great choice for your hybrid AR-15 builds. Made from 4150 CMV steel per Mil-B-11595E and finished with a durable black nitride treatment this barrel holds up under pressure with excellent corrosion resistance. This barrel fits all your standard AR-15 uppers if youre going for a fresh build with M4 feed ramps for reliability. Specifications for AT3 Tactical 7.62x39 Medium Profile AR-15 Barrel: Manufacturer: AT3 Tactical Color: Black Caliber: 7.62x39mm Barrel Length: 16 in Barrel Profile: Medium Gun Make: AR Platform Gun Model: AR-15 Package Contents: AT3 Tactical 7.62x39 Medium Profile AR-15 Barrel What firearm models does the manufacturer say AT3 Tactical 7.62x39 Medium Profile AR-15 Barrel is compatible with? The manufacturer suggests that AT3 Tactical 7.62x39 Medium Profile AR-15 Barrel is compatible with AR-15AT3 Tactical AT3-7.62x39-CAR-16: 7.62x39 Medium Profile 16 Inch AR-15 Barrel Black