Shaw AR-15 6mm ARC Threaded AR Complete Upper Receiver 22in HBar Rifle 1-7.5 Twist Weight 4lb Matte Stainless Barrel/Hard Coat Anodize Black Upp. Shaw is now proud to offer complete uppers directly to consumers. All AR-15 barrels are machined from 416R stainless steel and hybrid MLock/Picatinny provides endless mounting options. Standard features include NiB bolt carrier groups Radian Raptor LT charging handles and threaded muzzles. Specifications for Shaw AR-15 6mm ARC Threaded AR Complete Upper Receiver: Manufacturer: Shaw Caliber: 6mm ARC Barrel Profile: HBAR Gas System Length: Rifle Length Barrel Twist Rate: 1-7.5 Firearms Threads Per Inch: 5/8x24 Finish: Anodized Color: Black Fabric/Material: Stainless Steel Gas Block Journal Size-Diameter: .750 in Gun Type: Rifle Gun Make: AR Platform Gun Model: AR-15 Weight: 4 lb Barrel Material: 416R Stainless Steel Condition: New Flutes: No Features of Shaw AR-15 6mm ARC Threaded AR Complete Upper Receiver NiB BCG Superlative Arms Adjustable Gas Block Hybrid M-LOK Handguard Radian Raptor LT Charging Handle Glare Free Matte Finish Mil-Spec Upper Package Contents: Shaw AR-15 6mm ARC Threaded AR Complete Upper Receiver Thread Protector Gas Block Adjustment Tool What firearm models does the manufacturer say Shaw AR-15 6mm ARC Threaded AR Complete Upper Receiver is compatible with? The manufacturer says that Shaw AR-15 6mm ARC Threaded AR Complete Upper Receiver is compatible with AR-15Shaw AR15HBSS226ARC-UP: AR-15 6mm ARC Threaded Barrel 22in HBar Rifle 1-7.5 Twist Weight 4lb Matte Stainless Barrel/Hard Coat Anodize Black Upp