CMMG Banshee Mk47 7.62x39mm 12.5in Gen 2 Complete Upper Receiver

Not sure about an 8in barrel but not quite up for the 16in? At 12.5in, the Mk47 BANSHEE upper group is designed to scratch that 7.62x39mm itch. Built on the Mk47 platform, this upper works with Mk47 lowers and will not work with AR15 Mk4 or AR10 LR308 LR3 lowers. Specifications: Manufacturer CMMG; Caliber 7.62x39mm; Overall Length 21.4 in; Barrel Length 12.5 in; Barrel Profile Medium Tapered; Gas System Length Carbine; Barrel Twist 1-10; Threads per Inch 5/8x24; Muzzle Device CMMG Zeroed Linear Compensator; Finish Cerakote; Fabric/Material 7075 T6 Aluminum; Gas Block Journal Size-Diameter .750 in; Gun Rail M-LOK; Gun Make CMMG; Gun Model CMMG Banshee MK47; Weight 4.5 lb; Barrel Material 4140 Chrome Moly; Bolt Carrier Group Included MIL-SPEC; Magazine Included No; Charging Handle Included MIL-SPEC; Package Contents: CMMG Banshee Mk47 7.62x39mm 12.5in Gen 2 Complete Upper Receiver, ZEROED AR15 Polymer Dust Cover, ZEROED Mk47 Ambi Charging Handle, ZEROED Linear Compensator .308 Win; What firearm models is it compatible with? The Mk47 variant is designed for Mk47 lowers.