The Davidson Defense Marathon 14.5" 5.56 NATO AR-15 Pistol Upper is built for precision, durability, and smooth function. It features a 14.5" government profile barrel made from 4150 CrMoV steel with a phosphate finish, a 1:7 twist rate, and a carbine-length gas system with a 0.750 gas block for reliable cycling.
The included KAK Industry A2 Extended Flash Hider helps reduce muzzle flash and, when installed, brings the barrel length to meet rifle standards—making this upper pin-and-weld ready, though not yet permanently affixed. The 6061-T6 aluminum upper receiver and M-LOK handguard are Type III hard coat anodized for long-lasting durability. Also included are a nitride-finished bolt carrier group and a mil-spec AR-15 M4 charging handle, making this upper a high-performance, compliance-ready option for serious builders.
Caliber: 5.56x45mm NATO
Barrel Length: 14.5-inch
Barrel Material: 4150 CrMoV
Barrel Twist Rate: 1:7
Barrel Profile: Government
Barrel Finish: Phosphate
Barrel Thread Pitch: 1/2x28
Barrel Gas System Length: Carbine
Gas Block Size: 0.750
Muzzle Device: A2 Extended Flash Hider
Muzzle Device Thread Pitch: 1/2x28
Handguard Material: 6061-T6 Aluminum
Handguard Color: Black
Handguard Style: M-Lok
Upper Receiver Material: 6061-T6 Aluminum
Upper Receiver Finish: Type III Hard Coat Anodized
Bolt Carrier Material: 9310 Alloy Steel
Bolt Carrier Finish: Nitride
Charging Handle: AR-15 M4 Charging Handle Mil-Spec Quality
To view the most up-to-date shipping times Click HERE. To view Warranty, Returns, Terms & Restrictions Click HERE.
