ABC RIFLE COMPANY AR-15 .223 Remington/5.56x45mm NATO Pistol 10in Barrel Custom 10in Slanted M-LOK Handguard Complete Upper Receiver w/BCG And. 56 NATO platform built for reliability and accuracy. It features a 7075-T6 forged aluminum upper receiver paired with a 10in slant cut M-LOK handguard from ABC Rifle Co machined from 6061-T6 aluminum. The 10in barrel is crafted from 4150 CMV steel with a 1:7 twist fitted with a .750 low-profile steel gas block and a 9in stainless carbine-length gas tube. A 1/2x28 steel muzzle brake manages recoil. The nitride-finished 8620 bolt carrier group includes a 9310 MPI-tested bolt. Comes complete with a milspec forward assist steel ejection port cover and forged charging handle. Specifications for ABC RIFLE COMPANY AR-15 .223 Remington/5.56x45mm NATO Pistol 10in Barrel Custom 10in Slanted M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle: Manufacturer: ABC RIFLE COMPANY Caliber: .223 Remington 5.56mm 5.56x45mm NATO Barrel Length: 7.5 in Barrel Twist Rate: 1-7 Threads per Inch: 1/2x28 Muzzle Device: Custom Pine Style Muzzle Device Finish: Cerakote Color: Black Handguard Length: 7 in Gun Rail: M-LOK Gun Type: Rifle Gun Make: AR Platform Gun Model: AR-15 Gas Block Journal Size-Length: .750 in Bolt Carrier Group Included: MIL-SPEC Charging Handle Included: MIL-SPEC Package Contents: ABC RIFLE COMPANY AR-15 .223 Remington/5.56x45mm NATO Pistol 10in Barrel Custom 10in Slanted M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle What firearm models does the manufacturer say ABC RIFLE COMPANY AR-15 .223 Remington/5.56x45mm NATO Pistol 10in Barrel Custom 10in Slanted M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle is compatible with? The manufacturer says that ABC RIFLE COMPANY AR-15 .223 Remington/5.56x45mm NATO Pistol 10in Barrel Custom 10in Slanted M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle is compatible with AR-15ABC RIFLE COMPANY UA15-BR10-UCABC10: AR-15 .223 Remington/5.56x45mm NATO Pistol 10in Barrel Custom 10in Slanted M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle Black