Davidson Defense Marathon w/SBA5 Brace 14.5-inch Carbine-Gas 5.56 NATO AR-15 Pistol Full Build Kit Pin/Weld Ready with KAK Industry A2 Extended Flash Hider

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The Davidson Defense Marathon 14.5" Carbine-Gas 5.56 NATO AR-15 Pistol Full Build Kit with SBA5 Brace is built for precision, reliability, and compliance-ready performance. It features a 14.5" M4 profile barrel made from 4150 CrMoV steel with a phosphate finish and a 1:7 twist rate, optimized for 5.56 NATO. The carbine-length gas system and 0.750 gas block ensure smooth cycling.

Included is a KAK Industry A2 Extended Flash Hider, which, when installed, brings the total barrel length to meet rifle standards, making the kit pin-and-weld ready—though it has not yet been permanently attached. The 6061-T6 aluminum upper receiver is Type III hard coat anodized, and the free-float M-LOK handguard offers strength and modularity. A nitride-finished 9310 steel bolt carrier group, mil-spec charging handle, and SBA5 adjustable stabilizing brace complete this high-quality, all-in-one build kit.

Specifications

Caliber: 5.56x45mm NATO

Barrel Length: 14.5 inches

Barrel Material: 4150 CrMoV

Barrel Thread Pitch: 1/2x28

Barrel Gas System Length: Carbine

Barrel Finish: Parkerized/Phosphate

Barrel Profile: M4 Profile

Barrel Twist Rate: 1:7

Upper Receiver Material: 6061-T6 Aluminum

Upper Receiver Finish: Type III Hard Coat Anodized

Handguard Material: Aircraft-Grade Aluminum

Handguard Color: Black

Handguard Finish: Anodized

Handguard Style: Free Float, M-Lok Attachment System

Gas Block : Micro Low-Profile Gas Block for .750 O.D Barrel

Gas Block Size: 0.750

Gas Block Material: Steel

Gas Block Finish: Phosphate

Charging Handle: AR-15 M4 Charging Handle Mil-Spec Quality

Bolt Carrier: AR-15 5.56/.223/.300/.350 Complete Bolt Carrier Group *Made In The USA*

Bolt Carrier Material: 9310 Alloy Steel

Bolt Carrier Finish: Nitride

Muzzle Devic : A2 Extended Flash Hider

Muzzle Device Thread Pitch: 1/2x28

Muzzle Device Finish: Phosphate

Brace: SB Tactical SBA5 Pistol Stabilizing Brace

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Davidson Defense Marathon w/SBA5 Brace 14.5-inch Carbine-Gas 5.56 NATO AR-15 Pistol Full Build Kit Pin/Weld Ready with KAK Industry A2 Extended Flash Hider

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