Davidson Defense Marathon w/Magpul BTR Brace 14.5-inch Carbine-Gas 5.56 NATO AR-15 Pistol Full Build Kit Pin/Weld Ready

Part Number: PI-PK-556-63532-BTR

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Davidson Defense Marathon w/Magpul BTR Brace 14.5-inch Carbine-Gas 5.56 NATO AR-15 Pistol Full Build Kit Pin/Weld Ready

On sale ~~$384.99~~ $289.99

Retail Price:$384.99

Your Savings:$95.00(25%)

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The Davidson Defense Marathon 14.5" Carbine-Gas 5.56 NATO AR-15 Pistol Full Build Kit with Magpul BTR Brace offers a durable, compliant-ready platform for your next build. It features a 14.5" government profile barrel made from 4150 CrMoV steel with a phosphate finish, a 1:7 twist rate, and 1/2x28 threading—pin-and-weld ready for those needing to reach the legal 16" barrel length. The carbine-length gas system and low-profile gas block ensure smooth, reliable operation. The 6061-T6 aluminum upper receiver and lightweight aircraft-grade aluminum M-LOK handguard are both finished with Type III hard coat anodizing for enhanced durability. This kit also includes a mil-spec charging handle, a nitride-finished bolt carrier group, and a Magpul BTR pistol brace for added control and comfort—making it a practical, high-performance foundation for any AR-15 builder.

Specifications

Caliber: 5.56x45mm NATO

Barrel Name: 14.5" 5.56 NATO Barrel

Barrel Length: 14.5-inch

Barrel Material: 4150 CrMoV

Barrel Thread Pitch: 1/2x28

Barrel Finish: Phosphate

Barrel Profile: Government

Barrel Twist Rate: 1:7

Barrel Gas System Length: Carbine

Gas Block Name: Micro Low-Profile Gas Block

Gas Block Size: 0.750

Handguard Material: Aircraft-Grade Aluminum

Handguard Color: Black

Handguard Style: M-LOK

Upper Receiver Material: 6061-T6 Aluminum

Upper Receiver Finish: Type III Hard Coat Anodized

Charging Handle: AR-15 M4 Charging Handle Mil-Specp

Bolt Carrier Material: 8620 Alloy Steel (Body), 9310 Alloy Steel (Bolt Head)

Bolt Carrier Finish: Nitride

Pistol Brace: Magpul BTR

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Davidson Defense Marathon w/Magpul BTR Brace 14.5-inch Carbine-Gas 5.56 NATO AR-15 Pistol Full Build Kit Pin/Weld Ready

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