JE Machine Tech AR-15 5.56/.223 NATO Threaded Pistol Barrel 7.50in 1-7 Twist .750 Gas Block Standard Profile 1/2x28 4150/4151 CrMoV Steel Nitride. 50 STANDARD PROFILE 5.56 NATO PISTOL BARREL Specifications for JE Machine Tech AR-15 5.56/.223 NATO Threaded Pistol Barrel: Manufacturer: JE Machine Tech Color: Black Fabric/Material: 4150/4151 CrMoV Steel Caliber: 5.56mm Barrel Profile: Standard Gas System Length: Pistol Length Gas Block Journal Size-Diameter: .750 in Threads per Inch: 1/2x28 Barrel Twist Rate: 1-7 Barrel Material: 4151 Cmv-Nitride Gun Make: AR Platform Gun Model: AR-15 Additional Features: 7.50in Features of JE Machine Tech AR-15 5.56/.223 NATO Threaded Pistol Barrel Platform: AR15 Chambering: .223/5.56x45 NATO Twist rate: 1:7 Overall length: 7.5 Gas system length: Pistol .750 gas block Thread Pitch: 1/2-28 Material: 4150/4151 CrMoV Steel Finishing: Black Nitride Package Contents: JE Machine Tech AR-15 5.56/.223 NATO Threaded Pistol Barrel What firearm models does the manufacturer say JE Machine Tech AR-15 5.56/.223 NATO Threaded Pistol Barrel is compatible with? The manufacturer suggests that JE Machine Tech AR-15 5.56/.223 NATO Threaded Pistol Barrel is compatible with AR-15JE Machine Tech PS-BAL7: AR-15 5.56/.223 NATO Threaded Pistol Barrel 7.50in 1-7 Twist .750 Gas Block Standard Profile 1/2x28 4150/4151 CrMoV Steel Nitride Black