Faxon Firearms Match Series AR-15 6mm ARC 12.5in Upper Receiver Gunner Carbine Length 1-7.5 Twist 5/8x24 w/BCG Black. 5in 6mm ARC Barrel delivers precision performance in a compact package. Perfect for hunters competitors and modern AR enthusiasts this barrel offers match-grade accuracy with a balanced lightweight Gunner profile. Manufactured 100percent in-house from 416R stainless steel the Match Series features 5R hybrid rifling for improved velocity reduced jacket deformation and easier cleaning. Each barrel is fully stress relieved air-gauge tested and Magnetic Particle Inspected for the ultimate in quality assurance. Specifications for Faxon Firearms Match Series AR-15 6mm ARC 12.5in Upper Receiver: Manufacturer: Faxon Firearms Caliber: 6mm XC Overall Length: 21.75 in Barrel Length: 12.5 in Barrel Profile: Gunner Barrel Twist Rate: 1-7.5 Firearms Threads Per Inch: 5/8x24 Color: Black Gun Model: AR-15 Fabric/Material: Stainless Steel Handguard Length: 10.75 in Gun Make: AR Platform Flutes: No Package Contents: Faxon Firearms Match Series AR-15 6mm ARC 12.5in Upper Receiver What firearm models does the manufacturer say Faxon Firearms Match Series AR-15 6mm ARC 12.5in Upper Receiver is compatible with? The manufacturer suggests that Faxon Firearms Match Series AR-15 6mm ARC 12.5in Upper Receiver is compatible with AR-15Faxon Firearms FX-URG-M6A125GA1075-C: Match Series AR-15 6mm ARC 12.5in Upper Receiver Gunner Carbine Length 1-7.5 Twist 5/8x24 w/BCG Black