Bear Creek Arsenal BC-10 .308 16in Right Side Upper Receiver Heavy Mid-Length 1-10 5/8x24 Flash Hider Parkerized Tungsten. 308 rifle length upper has a 16 parkerized Heavy barrel and features a 110 twist rate with a mid-length gas system. It includes a 15 MLOK split rail an M4 flat-top billet upper receiver a BCA AR10 bolt carrier group a flash hider and a right-side charging (Gen2) handle (patent protected). This 308 upper is compatible with 1st gen DPMS low profile lowers. Magazine not included. Specifications for Bear Creek Arsenal BC-10 .308 16in Right Side Charging Upper Receiver: Manufacturer: Bear Creek Arsenal Caliber: .308 Winchester Barrel Length: 16 in Barrel Profile: Heavy Gas System Length: Mid Length Barrel Twist Rate: 1-10 Threads per Inch: 5/8x24 Muzzle Device: Flash Hider Finish: Parkerized Gun Model: AR-10 Handguard Length: 15 in Gun Rail: M-LOK Gun Make: AR Platform Weight: 7.25 lb Flutes: No Package Contents: Bear Creek Arsenal BC-10 .308 16in Right Side Charging Upper Receiver What firearm models does the manufacturer say Bear Creek Arsenal BC-10 .308 16in Right Side Charging Upper Receiver is compatible with? The manufacturer suggests that Bear Creek Arsenal BC-10 .308 16in Right Side Charging Upper Receiver is compatible with AR-10Bear Creek Arsenal UASCC5011308MHB1611015TNGSR: BC-10 .308 16in Right Side Upper Receiver Heavy Mid-Length 1-10 5/8x24 Flash Hider Parkerized Tungsten