ABC RIFLE COMPANY AR-15 .223 Remington/5.56x45mm NATO Pistol 7in Barrel Custom 7in Top Cut Hybrid M-LOK Handguard Complete Upper Receiver w/BCG And. The 7.5in 4150 CMV barrel with 1:8 twist pairs with a steel A2 birdcage flash hider for dependable accuracy and flash reduction. A steel barrel nut .750 gas block and 6.75in stainless pistol gas tube ensure consistent cycling. Finished with an MPI-tested nitride BCG forged charging handle forward assist and milspec ejection port coverthis upper is mission-focused and ready to run. Specifications for ABC RIFLE COMPANY AR-15 .223 Remington/5.56x45mm NATO Pistol 7in Barrel Custom 7in Top Cut Hybrid M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle: Manufacturer: ABC RIFLE COMPANY Caliber: 5.56mm .223 Remington 5.56x45mm NATO Barrel Length: 7.5 in Barrel Twist Rate: 1-7 Threads per Inch: 1/2x28 Muzzle Device: A2 Flash Hider Gun Model: AR-15 Handguard Length: 7 in Gun Rail: M-LOK Gun Type: Rifle Gun Make: AR Platform 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 7in Barrel Custom 7in 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 7in Barrel Custom 7in 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 7in Barrel Custom 7in Top Cut Hybrid M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle is compatible with AR-15ABC RIFLE COMPANY UA15-BR7-TCABC7-SG: AR-15 .223 Remington/5.56x45mm NATO Pistol 7in Barrel Custom 7in Top Cut Hybrid M-LOK Handguard Complete Upper Receiver w/BCG And Charging Handle Sniper Grey