Details
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 1/2×28 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: 1/2×28
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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