Rainier Arms Match .223 Wylde Lightweight Barrel 18in 1-8 Twist 1/2x28 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 you have a barrel that is the best value hands down in the industry. Specifications for Rainier Arms AR Match .223 Wylde Lightweight Barrel: Manufacturer: Rainier Arms Color: Silver Fabric/Material: Stainless Steel Caliber: .223 Wylde Barrel Profile: M4 Gas Block Journal Size-Diameter: .625 in Threads per Inch: 1/2x28 Barrel Twist Rate: 1-8 Gun Make: AR Platform Gun Model: AR-15 Package Contents: Rainier Arms Match .223 Wylde Lightweight Barrel What firearm models does the manufacturer say Rainier Arms AR Match .223 Wylde Lightweight Barrel is compatible with? The manufacturer suggests that Rainier Arms AR Match .223 Wylde Lightweight Barrel is compatible with AR-15Rainier Arms RAB-M-223-LW-18-R-NF-SAT: Match .223 Wylde Lightweight Barrel 18in 1-8 Twist 1/2x28 Silver Medium