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

Davidson Defense Harbinger 11.5-Inch Carbine-Gas 1-in-8 .223 Wylde AR-15 Freefloat Tubular M-LOK Pistol Full Build Kit SBR Ready

The Davidson Defense Harbinger Full Build Kit is a .223 Wylde AR-15 pistol configuration built around an 11.5-inch government profile barrel with a 1-in-8 twist rate and a carbine-length gas system. The kit includes a 5.56 nitride bolt carrier group, AR-15 M4 mil-spec charging handle, lower parts kit, mil-spec heavy-duty AR-15 6-position buffer tube, 3 oz buffer, recoil spring, end plate, and castle nut. This kit is SBR Ready and ships without a brace. The lower receiver is not included.

Key Features

• 11.5-inch government profile .223 Wylde barrel, 4140 CrMoV steel, nitride finish, 1-in-8 twist, carbine-length gas system, 1-in-2x28 thread pitch
• 12.5-inch tubular M-LOK freefloat handguard
• Stripped AR-15 upper receiver, M4 feed ramps, 7075 T6 aluminum, anodized finish
• 5.56 nitride bolt carrier group, 9310 alloy steel, nitride finish
• AR-15 M4 mil-spec charging handle
• Micro low-profile gas block, 0.750 barrel diameter compatible, barrel steel
• Steel flash can muzzle device, black oxide finish, 1-in-2x28 thread pitch
• Mil-spec heavy-duty AR-15 6-position buffer tube
• Buffer, 3 oz
• SBR Ready configuration
• Lower receiver not included

Perfect For

• AR-15 pistol builders seeking a compact .223 Wylde configuration without a brace
• Gunsmiths sourcing a complete kit and selecting their own final brace or stock
• Builders prioritizing a carbine-length gas system in an 11.5-inch barrel
• Enthusiasts selecting a tubular M-LOK handguard platform for their pistol build

Barrel and Upper Receiver

The 11.5-inch government profile barrel is made from 4140 CrMoV steel with a nitride finish and a 1-in-8 twist rate. The barrel is threaded at 1-in-2x28 and uses a carbine-length gas system with an included micro low-profile gas block compatible with 0.750 barrel diameters. The stripped AR-15 upper receiver features M4 feed ramps and is constructed from 7075 T6 aluminum with an anodized finish.

12.5-Inch Tubular M-LOK Freefloat Handguard

The 12.5-inch tubular M-LOK freefloat handguard provides M-LOK interface slots along its exterior for accessory attachment. At 12.5 inches, the handguard extends past the 11.5-inch barrel, meaning the barrel does not protrude past the handguard. The included muzzle device provides the length needed to clear the handguard profile. No handguard material was provided in the spec sheet, so material details are omitted here.

5.56 Bolt Carrier Group and Charging Handle

The 5.56 nitride bolt carrier group is constructed from 9310 alloy steel with a nitride finish and is compatible with .223 Wylde, 5.56 NATO, .300 Blackout, and .350 Legend configurations. The AR-15 M4 mil-spec charging handle is included as part of the upper operating components in this kit.

SBR Ready Configuration

This kit is configured as SBR Ready and ships without a brace, allowing the buyer to select their own final setup. The configuration is intended for customers who are sourcing a brace or planning a setup based on their own requirements. Final configuration is setup dependent and the buyer is responsible for ensuring compliance with all applicable laws before selecting and adding any brace or stock to this kit.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Ships without a brace. Do not install a stock unless compliant with applicable laws. Lower receiver not included.