The Thermosphere 18-inch Rifle-Gas 1:7.5 6MM ARC AR-15 Complete Upper is engineered for accuracy and reliability. It features an 18-inch barrel crafted from 4150 CrMoV steel with a government profile and a 1:7.5 twist rate, providing consistent performance for the 6mm ARC caliber. The rifle gas system and .750” gas block ensure smooth cycling, while the nitrided finish offers durable corrosion resistance.
This upper is fitted with a lightweight M-Lok freefloat handguard, made from 6061-T6 aluminum in a sleek black finish, allowing for modular accessory attachment without adding unnecessary weight. The billet upper receiver is also constructed from 6061-T6 aluminum, with a Type III Hard Coat Anodized finish for added durability. A micro low-profile gas block and a GI birdcage flash hider complete the package. This complete upper is designed for compatibility with standard AR-15 lower receivers, making it a versatile option for any gunsmith seeking precision and reliability.
Caliber: 6mm ARC
Barrel Length: 18-inch
Barrel Gas System Length: Rifle
Barrel Material: 4150 CrMoV
Barrel Finish: Nitride
Barrel Profile: Government
Barrel Twist Rate: 1:7.5
Barrel Thread Pitch: 5/8x24
Total Weight: 74.4
Handguard Style: M-Lok Free Float
Handguard Color: Black
Handguard Material: 6061-T6 Aluminum
Upper Receiver: Black Diamond Series AR-15 Slick Side Billet Upper Receiver, USA Made
Upper Receiver Material: 6061-T6 Billet Aluminum
Upper Receiver Finish: Type III Hard Coat Anodized
Gas Block: Micro Low-Profile Gas Block, .750 O.D Barrel Steel
Gas Block Size: 0.750
Muzzle Device: AR-15 TPI GI Birdcage Flash Hider
Muzzle Thread Pitch: 5/8x24
Charging Handle: AR-15 M4 Charging Handle Mil-Spec Quality
Bolt Carrier: AR-15 6.5 Grendel II QPQ Nitride Complete Bolt Carrier Group
Bolt Carrier Material: 9310 Alloy Steel
Bolt Carrier Finish: Nitride
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