The Criterion CORE Series is an ideal pairing for the versatile .300 AAC Blackout cartridge. The modern taper design is a departure and improvement upon government contoursprofiles that have harsh diameter variations and lack material where it is needed most. The CORE Series continuous taper design aids in heat absorption, harmonics, balance, handling, and ultimately, accuracy. This contour is an ideal balance between weight and intelligently distributed material capable of enduring hard use and intensive training schedules without slowing you down. The CORE Series features a balanced front end that works for you when used in conjunction with modern accessories like weapon lights, IR lasers, suppressors, and clip on night vision devises. Paired with a 1-7 twist and Criterion's 5-groove rifling, the 8.5in and 10.5in can stabilize a wide range of BOTH subsonic and supersonic bullets. If you plan on using a suppressor, it will also ensure subsonic loads are not pushed beyond the supersonic threshold. Specifications for Criterion Barrels AR-15 300 Blackout 10.5in Hybrid Threaded Barrel: Manufacturer: Criterion Barrels Color: Black Finish: Chrome-Lined Fabric/Material: CM-CrMoV Caliber: .300 AAC Blackout Barrel Length: 10.5 in Threads per Inch: 1/2x28 Barrel Twist Rate: 1-7 Barrel Material: 4150 Chrome Moly Vanadium Gun Make: AR Platform Gun Model: AR-15 Weight: 1.25 lb Gas Block Journal Size-Length: .750 in Features of Criterion Barrels AR-15 300 Blackout 10.5in Hybrid Threaded Barrel Made of 4150CMV ordnance grade barrel steel for increased durability and its ability to handle heat from hard use Chrome-lined for superior barrel life and corrosion resistance. Our chrome-lining process is the most refined in the industry and will not degrade accuracy Hand-lapped rifling for a pristine internal finishthis increases land engagement while minimizing bullet defamation which is paramount for accuracy and longevity Polished chambers for reliable extraction 1-7 twist rate, ideal for use with both subsonic an supersonic loads 5-groove rifling, aids in maximizing land engagement and minimizing bullet deformation Finely tuned gas port for use with and without a suppressor Mil-spec magnesium phosphate exterior finish for added corrosion resistance 5/8-24 TPI muzzle threads, compatible with a wide range of muzzle devices and suppressors M4 style barrel extension .750in Gas Block, dimpled for ease of installation Package Contents: Criterion Barrels AR-15 300 Blackout 10.5in Hybrid Threaded Barrel Which weapon models is Criterion Barrels AR-15 300 Blackout 10.5in Hybrid Threaded Barrel compatible with? Criterion Barrels AR-15 300 Blackout 10.5in Hybrid Threaded Barrel is compatible with AR-15