Rosco Manufacturing Purebred .223 Wylde SPR Threaded Barrel Stainless 18in. 223 Wylde Barrel was made to enhance the performance of the original SPR. The SPR contour is well suited for cold bore shots on target as well as keeping the weight at a great balance. Gas ports were sized according to the most popular precision bullet weights and suppressor use. Specifications for Rosco Manufacturing Purebred .223 Wylde SPR Threaded Barrel: Manufacturer: Rosco Manufacturing Color: Silver Fabric/Material: 416R Material Caliber: .223 Wylde Barrel Profile: SPR Gas System Length: Rifle Length Gas Block Journal Size-Diameter: .750 in Barrel Twist Rate: 1-7 Barrel Material: 416 R-Nitride Gun Make: AR Platform Gun Model: AR-15 Weight: 43 oz Gun Type: Rifle Firearms Threads Per Inch: 1/2x28 Handle Finish: Bead Blasted Blade Finish: Bead Blasted Features of Rosco Manufacturing Purebred .223 Wylde SPR Threaded Barrel Non-Adjustable Gas Block V2 Package Contents: Rosco Manufacturing Purebred .223 Wylde SPR Threaded Barrel What firearm models does the manufacturer say Rosco Manufacturing Purebred .223 Wylde SPR Threaded Barrel is compatible with? The manufacturer suggests that Rosco Manufacturing Purebred .223 Wylde SPR Threaded Barrel is compatible with AR-15Rosco Manufacturing PB-18-SPR-223W-7-R: Purebred .223 Wylde SPR Threaded Barrel Stainless 18in