Faxon Firearms Match Barrel AR Platform AR-15 300 BLK 7.5in Gunner Pistol Length 1-5 Twist 5/8x24 Thread Black. The 300 Blackout cartridge yields increased performance in shorter barrels and effective subsonic performance. By speeding up the twist rate to 1:5 from common 300 BLK rates of 1:7 and 1:8 these Faxon Match Series Gunner Barrels increase projectile stabilization and energy on target. The Gunner profile is a blend of two of the best performing profiles of all time GOVT/SOCOM and Pencil. Faxon's Gunner profile combines the durability of the GOVT/SOCOM profile with the weight savings and maneuverability of the Pencil profile. The Gunner profile brings the balance of the rifle back towards the shooter's body limiting fatigue and allowing for shooting training or hunting all day long. Faxon Firearms barrels are the pinnacle of value. Manufactured in-house in Greater Cincinnati Ohio Faxon barrels are fully stress relieved air-gauge tested and 11-degree target crowned to ensure superior accuracy. Quality is imbued into Faxon Firearms barrels from the beginning of the manufacturing process. Faxon Match Series Barrels are made of 416-R Stainless Steel given 5R rifling and a NP3 (Nickel Teflon) barrel extension. Faxon barrels are Magnetic Particle Inspected (MPI) in-house do assure the greatest quality for a lifetime of service. Each barrel goes through a battery of tests at each operation until finished in Nitride and final inspected. All barrels are individually checked for headspace with precision custom-hardened PTG gauges. Specifications for Faxon Firearms Match 300 BLK Barrel: Manufacturer: Faxon Firearms Color: Black Finish: Nitride Fabric/Material: 416R Stainless Steel Caliber: .300 AAC Blackout Barrel Profile: Gunner Gas System Length: Pistol Length Gas Block Journal Size-Diameter: .750 in Threads per Inch: 5/8x24 Barrel Twist Rate: 1-5 Gun Make: AR Platform Gun Model: AR-15 Condition: New Package Contents: Faxon Firearms Match 300 BLK Barrel What firearm models does the manufacturer say Faxon Firearms Match 300 BLK Barrel is compatible with? The manufacturer says that Faxon Firearms Match 300 BLK Barrel is compatible with AR-15Faxon Firearms 15B35P7NGQ-5R-NP3: Match Barrel AR Platform AR-15 300 BLK 7.5in Gunner Pistol Length 1-5 Twist 5/8x24 Thread Black