The Davidson Defense Marathon 14.5" 5.56 NATO AR-15 Pistol Complete Upper is built for durability, reliability, and performance. It features a 14.5" M4 profile barrel made from 4150 CrMoV steel with a Parkerized finish, a 1:7 twist rate, and 1/2x28 threading—ready for the user to add and pin/weld a muzzle device to meet the 16" minimum barrel length requirement. The upper receiver is machined from 6061-T6 aluminum with a Type III hardcoat anodized finish for added wear resistance. A 0.750 gas block and carbine-length gas system ensure smooth operation, while the included nitride-finished 9310 steel bolt carrier group delivers long-term durability. Finished with a lightweight, aircraft-grade aluminum M-LOK handguard, this complete upper offers a high-performance foundation for any AR-15 build.
Caliber: 5.56x45mm NATO
Barrel Material: 4150 CrMoV
Barrel Thread Pitch: 1/2x28
Barrel Length: 14.5-inch
Barrel Twist Rate: 1:7
Barrel Finish: Parkerized (Phosphate)
Barrel Profile: M4 Profile
Gas System: Carbine
Gas Block Size: 0.750
Bolt Carrier Material: 9310 Alloy Steel
Bolt Carrier Finish: Nitride
Bolt Carrier: Complete Bolt Carrier Group
Charging Handle: AR-15 M4 Charging Handle Mil-Spec Quality
Upper Receiver Material: 6061-T6 Aluminum
Upper Receiver Finish: Type III Hard Coat Anodized
Handguard Material: Aircraft-Grade Aluminum
Handguard Color: Black
Handguard Style: M-LOK, Ultra-Lightweight Minimalist
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