ABC RIFLE COMPANY AR-15 .223 Remington/5.56x45mm NATO Pistol 10in Barrel Custom 10in Top Cut Hybrid M-LOK Handguard Complete Upper Receiver w/BCG And. The 10in 4150 CMV barrel with 1:7 twist and A2 birdcage flash hider delivers solid velocity and accuracy. A steel barrel nut .750 gas block and 6.75in stainless pistol gas system ensure fast reliable cycling. Completed with an MPI-tested nitride BCG forged milspec charging handle forward assist and ejection port coverits built for serious range time. Specifications for ABC RIFLE COMPANY AR-15 .223 Remington/5.56x45mm NATO Pistol 10in Barrel Custom 10in Top Cut Hybrid M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle: Manufacturer: ABC RIFLE COMPANY Caliber: 5.56x45mm NATO .223 Remington 5.56mm Barrel Length: 10.5 in 10 in Barrel Twist Rate: 1-7 Threads per Inch: 1/2x28 Muzzle Device: A2 Flash Hider Finish: Anodized Color: Black Handguard Length: 10 in Gun Rail: M-LOK Gun Type: Rifle Gun Make: AR Platform Gun Model: AR-15 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 Top Cut Hybrid 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 Top Cut Hybrid M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle is compatible with? The manufacturer suggests that ABC RIFLE COMPANY AR-15 .223 Remington/5.56x45mm NATO Pistol 10in Barrel Custom 10in Top Cut Hybrid M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle is compatible with AR-15ABC RIFLE COMPANY UA15-BR10-TCABC10: AR-15 .223 Remington/5.56x45mm NATO Pistol 10in Barrel Custom 10in Top Cut Hybrid M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle Black