Rainier Arms Match 6.5 Grendel Barrel 18in 1-8 Twist 5/8x24 Silver Medium. They are able to reach their goal by sourcing a very high end barrel blank at an affordable price. They start off using a high precision match blank in 1:8 twist machine it to the highest quality and matched with their limited-life time warranty you have a barrel that is the best value hands down in the industry. They are so confident in their Match barrels that They will offer a 100percent money back guarantee within 90 days of purchase. If you aren't completely satisfied with the barrel for any reason return it for a full refund no questions asked. They offer a 1:8 twist to accommodate to a wide range of bullet weights. Guaranteed to shoot sub-MOA with match grade ammo. Specifications for Rainier Arms AR Match 6.5 Grendel Barrel: Manufacturer: Rainier Arms Color: Silver Fabric/Material: Stainless Steel Caliber: 6.5mm Grendel Barrel Profile: M4 Gas System Length: Mid Length Gas Block Journal Size-Diameter: .750 in Threads per Inch: 5/8x24 Barrel Twist Rate: 1-8 Flutes: No Gun Make: AR Platform Gun Model: AR-15 Package Contents: Rainier Arms Match 6.5 Grendel Barrel What firearm models does the manufacturer say Rainier Arms AR Match 6.5 Grendel Barrel is compatible with? The manufacturer suggests that Rainier Arms AR Match 6.5 Grendel Barrel is compatible with AR-15Rainier Arms RAB-M-65G-18-R-NF-SAT: Match 6.5 Grendel Barrel 18in 1-8 Twist 5/8x24 Silver Medium