The Marathon Chrome Lined 14.5-inch Mid-Gas 1:7 5.56 NATO AR-15 Freefloat M-Lok Handguard Pistol Upper Build Kit from Davidson Defense is engineered for precision and performance. This upper assembly features a 14.5-inch barrel made from 4140 gun steel, with a chrome-lined finish for improved durability. The medium-profile barrel includes a 1:7 twist rate, optimizing stability and accuracy with a variety of 5.56x45mm NATO ammunition.
It uses a mid-length gas system, paired with a micro low-profile gas block for efficient operation. The A2 extended flash hider completes the muzzle assembly with a 1/2x28 thread pitch. The handguard is constructed from aircraft-grade aluminum, offering a free-floating design in a sleek black finish and M-Lok compatibility for accessory attachment. The upper receiver is made from anodized 6061-T6 aluminum and features a forward-assist-less design, enhancing the overall lightweight and streamlined profile of the build.
Platform: AR-15
Caliber: 5.56x45mm NATO
Barrel: 14.5" 5.56 NATO AR-15 Barrel, Chrome Lined, Phosphate Finish, 1:7 Twist, Mid-Length Gas, 4140R Steel
Barrel Material: 4140 Gun Steel
Barrel Length: 14.5-inch
Barrel Finish: Phosphate
Barrel Profile: Medium
Barrel Twist Rate: 1:7
Barrel Thread Pitch: 1/2x28
Barrel Gas System Length: Mid-Length
Gas Block: Micro Low-Profile Gas Block for .750 O.D Barrel Steel
Gas Block Size: 0.750
Muzzle Device: A2 Extended Flash Hider
Muzzle Thread Pitch: 1/2x28
Handguard Material: Aircraft-Grade Aluminum
Handguard Color: Black
Handguard Style: Free Float
Upper Receiver: Black Diamond Series AR-15 Billet Upper Receiver No Forward Assist
Upper Receiver Material: 6061-T6 Aluminum
Upper Receiver Finish: Anodized
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