The Thermosphere 18-inch Rifle-Gas 1:7.5 6MM ARC AR-15 Freefloat M-Lok Handguard Rifle Upper Build Kit from Davidson Defense is engineered for precision shooting and compatibility. This build kit features an 18-inch 6mm ARC barrel, constructed from durable 4150 CrMoV steel with a Nitride finish, ensuring longevity and performance. The barrel has a government profile, 1:7.5 twist rate, and a .750" gas block journal, allowing for reliable gas operation with a rifle-length gas system.
Included is a micro low-profile gas block and a GI Birdcage flash hider with a 5/8x24 thread pitch. The upper receiver is a Black Diamond Series AR-15 Slick Side, crafted from USA-made 6061-T6 billet aluminum, finished with Type III hard coat anodizing for resilience. The 15-inch M-LOK free-float handguard, also made of 6061-T6 aluminum, provides ample rail space for accessories while maintaining a lightweight profile, making it ideal for serious shooters.
Caliber: 6mm ARC
Barrel Length: 18-inch
Barrel Material: 4150 CrMoV
Barrel Thread Pitch: 5/8x24
Color: Black
Barrel Finish: Nitride
Barrel Profile: Government
Barrel Twist Rate: 1:7.5
Barrel Gas System Length: Rifle
Gas Block: Micro Low-Profile Gas Block, .750 O.D Barrel Steel
Gas Block Size: 0.750
Gas Block Material: Steel
Muzzle Device: AR-15 TPI GI Birdcage Flash Hider for .308 7.62x39 .300 Blackout
Muzzle Thread Pitch: 5/8x24
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
Handguard Material: 6061-T6 Aluminum
Handguard Color: Black
Handguard Style: 15” M-LOK Free Float Extended Quad Rail
To view the most up-to-date shipping times Click HERE. To view Warranty, Returns, Terms & Restrictions Click HERE.
