Shaw AR-15 450 Bushmaster Threaded Barrel No Flute 18in HBAR Profile 1-24 Twist 11/16-24 Thread Matte Stainless. Shaw is now proud to offer complete barrels directly to consumers. Specifications for Shaw AR-15 450 Bushmaster Threaded Barrel: Manufacturer: Shaw Color: Steel Finish: Matte Fabric/Material: Stainless Steel Caliber: .450 Bushmaster Barrel Length: 18 in Barrel Profile: HBAR Gas System Length: Mid Length Gas Block Journal Size-Diameter: .875 in Threads per Inch: 11/16x24 Barrel Twist Rate: 1-24 Barrel Material: 416R Stainless Steel Flutes: No Gun Make: AR Platform Gun Model: AR-15 Weight: 2.2 lb Gun Type: Rifle Package Contents: Shaw AR-15 450 Bushmaster Threaded Barrel What firearm models does the manufacturer say Shaw AR-15 450 Bushmaster Threaded Barrel is compatible with? The manufacturer suggests that Shaw AR-15 450 Bushmaster Threaded Barrel is compatible with AR-15Shaw AR15HBSS18BUSH: AR-15 450 Bushmaster Threaded Barrel No Flute 18in HBAR Profile 1-24 Twist 11/16-24 Thread Matte Stainless