ABC RIFLE COMPANY AR-15 7.62x39mm Micro Pistol 5in Barrel M-LOK Handguard Upper Receiver w/BCG And Charging Handle Olive Drab Green. The 5in 4150 CMV barrel with a 1:9.5 twist is optimized for 7.62x39mm and paired with a 5/8x24 7075 aluminum flash can to control muzzle blast. A micro-length stainless steel gas tube and low-profile .750 steel gas block ensure reliable cycling. Its completed with a full-auto rated nitride BCG (8620 carrier 9310 7.62x39mm bolt) enhanced firing pin and full milspec components including the ejection port cover forward assist and a forged 6061-T6 charging handle. Built tough and ready to go. Specifications for ABC RIFLE COMPANY AR-15 7.62x39mm Micro Pistol 5in Barrel M-LOK Handguard Upper Receiver w/BCG And Charging Handle: Manufacturer: ABC RIFLE COMPANY Caliber: 7.62x39mm Barrel Length: 5 in Barrel Twist Rate: 1-10 Threads per Inch: 5/8x24 Muzzle Device: Muzzle Diverter Flash Can Handguard Length: 4.5 in Gun Rail: M-LOK 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 7.62x39mm Micro Pistol 5in Barrel M-LOK Handguard Upper Receiver w/BCG And Charging Handle What firearm models does the manufacturer say ABC RIFLE COMPANY AR-15 7.62x39mm Micro Pistol 5in Barrel M-LOK Handguard Upper Receiver w/BCG And Charging Handle is compatible with? The manufacturer says that ABC RIFLE COMPANY AR-15 7.62x39mm Micro Pistol 5in Barrel M-LOK Handguard Upper Receiver w/BCG And Charging Handle is compatible with AR-15ABC RIFLE COMPANY UA762-BR5-ML4D-ODG: AR-15 7.62x39mm Micro Pistol 5in Barrel M-LOK Handguard Upper Receiver w/BCG And Charging Handle Olive Drab Green