Davidson Defense Harbinger 11.5-inch Carbine-Gas 1:8 .223 Wylde AR-15 Freefloat Tubular M-Lok Handguard Pistol Upper Build Kit

Harbinger 11.5-Inch Carbine-Gas 1-8 .223 Wylde AR-15 Freefloat Tubular M-Lok Handguard Pistol Upper Build Kit - Davidson Defense

This upper build kit from Davidson Defense is chambered in .223 Wylde and built around an 11.5-inch 4140 CrMoV barrel with a government profile, nitride finish, 1-8 twist rate, and 1-2x28 threaded muzzle. The carbine-length gas system pairs with a micro low-profile steel gas block at .750 O.D. and a stainless steel gas tube. The upper receiver is machined from 7075 T6 aluminum with an anodized finish and includes M4 feed ramps, an aluminum dust cover, and a forward assist. The freefloat tubular M-Lok handguard is aluminum construction in black. A Steel Flash Can Design 11 muzzle device with a 1-2x28 thread pitch is included. BCG and charging handle are not included.

Key Features

• 11.5-inch 4140 CrMoV barrel, nitride finish, government profile, 1-8 twist, .223 Wylde
• Carbine-length gas system, micro low-profile steel gas block, .750 O.D., stainless steel gas tube
• 7075 T6 aluminum upper receiver, anodized finish, M4 feed ramps
• Aluminum dust cover and forward assist included
• Freefloat tubular M-Lok handguard, aluminum, black
• Steel Flash Can Design 11 muzzle device, 1-2x28 thread pitch
• BCG and charging handle not included

Perfect For

• Builders seeking a Davidson Defense .223 Wylde pistol upper build kit with an 11.5-inch government profile barrel
• AR-15 pistol builds requiring a carbine-length gas system with a freefloat tubular M-Lok handguard
• Builds prioritizing a nitride-finished barrel with a 1-8 twist rate in .223 Wylde
• Builders who prefer to source their own BCG and charging handle separately

11.5-Inch .223 Wylde Government Profile Barrel

The 11.5-inch barrel is machined from 4140 CrMoV steel to a government profile with a nitride finish inside and out. The .223 Wylde chamber accepts both .223 Remington and 5.56 NATO ammunition. A 1-8 twist rate supports a broad range of bullet weights within the .223 Wylde chambering. The 1-2x28 threaded muzzle is compatible with standard AR-15 muzzle devices, and the Steel Flash Can Design 11 is included with this kit.

7075 T6 Aluminum Upper Receiver

The upper receiver in this kit is machined from 7075 T6 aluminum with an anodized finish. M4 feed ramps are cut into the receiver for consistent cartridge feeding. An aluminum dust cover and forward assist are included as part of the upper receiver component in this kit. This receiver is a standard configuration upper, distinct from the dedicated right side charging variants in other Ridgeline builds.

Freefloat Tubular M-Lok Handguard

The freefloat tubular M-Lok handguard is constructed from aluminum in black and surrounds the barrel without contact, keeping the barrel free from handguard pressure. The tubular profile provides a consistent outside diameter along its length, with M-Lok attachment points for compatible accessories. The streamlined form keeps the overall package compact, which suits the 11.5-inch pistol configuration of this build kit.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. BCG and charging handle are not included.