Davidson Defense Marathon 14.5-inch Carbine-Gas 5.56 NATO AR-15 Pistol Upper Build Kit Pin/Weld Ready with KAK Industry A2 Extended Flash Hider

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Retail Price:$171.99

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Description
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The Davidson Defense Marathon 14.5" Carbine-Gas 5.56 NATO AR-15 Pistol Upper Build Kit is built for reliable performance in a compact, compliance-ready platform. It features a 14.5" 4150 CrMoV steel barrel with a phosphate finish, 1:7 twist rate, and a carbine-length gas system paired with a low-profile gas block and stainless steel gas tube for smooth operation.

The included KAK Industry A2 Extended Flash Hider, when installed, brings the overall barrel length to the required length for rifle builds—making this setup pin-and-weld ready, though it has not been permanently affixed. The upper receiver is crafted from 6061-T6 aluminum with an anodized finish, and the 12" aircraft-grade aluminum M-LOK handguard offers lightweight durability and accessory flexibility. This kit is an ideal foundation for builders seeking to create a compact, compliant AR-15 rifle.

Specifications

Barrel Length: 14.5-inch

Caliber: 5.56x45mm NATO

Barrel Twist Rate: 1:7

Barrel Thread Pitch: 1/2x28

Barrel Finish: Phosphate

Barrel Profile: Government

Barrel Material: 4150 CrMoV

Barrel Gas System: Carbine

Gas Block Size: 0.750

Gas Tube: Carbine Length Stainless Steel Gas Tube AR15

Gas Tube Material: Stainless Steel

Gas Block Profile: Low-Profile

Gas Block Material: Steel

Gas Block Finish: Phosphate

Upper Receiver Material: 6061-T6 Aluminum

Upper Receiver Finish: Anodized

Handguard Length: 12-inch

Handguard Material: Aircraft-Grade Aluminum

Handguard Color: Black

Handguard Style: M-Lok

Muzzle Device: A2 Extended Flash Hider, 1/2x28, Pre drilled hole for pin and weld

Muzzle Device Thread Pitch: 1/2x28

Muzzle Device Finish: Phosphate

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Davidson Defense Marathon 14.5-inch Carbine-Gas 5.56 NATO AR-15 Pistol Upper Build Kit Pin/Weld Ready with KAK Industry A2 Extended Flash Hider

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