TacFire 7.62x39mm 5 inch Upper Receiver 1-10 Twist 5/8x24 A2 Flash Hider Nitride Black. 62x39mm 5" Black Nitride Barrel - The Tacfire 5" 7.62 X 39 Complete Upper Assembly amplifies precision and performance utilizing an upper assembly that is expertly designed for maximal functionality. Dive into a world where impeccable features and craftsmanship merge ensuring precision and trustworthiness in every shot. Specifications for TacFire 7.62x39mm 5 inch Upper Receiver: Manufacturer: TacFire Caliber: 7.62x39mm Overall Length: 5.5 in Barrel Length: 5 - 6 in 5 in Barrel Profile: Government Barrel Twist Rate: 1-9.5 Firearms Threads Per Inch: 5/8x24 Handguard Type: M-LOK ATLAS S-ONE Muzzle Device: A2 Flash Hider Finish: Black Nitride Color: Black Fabric/Material: Steel Handguard Length: 4 in Gun Make: AR Platform Additional Features: 1-10in. Twist TacFire BU762395 7.62x39mm 5" Black Nitride Barrel TacFire BU762395: 7.62x39mm 5 inch Upper Receiver 1-10 Twist 5/8x24 A2 Flash Hider Nitride Black