Davidson Defense Harbinger w/SBA5 Brace 11.5-inch Carbine-Gas 1:8 .223 Wylde AR-15 Freefloat Tubular M-Lok Handguard Pistol Full Build Kit

Davidson Defense Harbinger with SB Tactical SBA5 Brace 11.5-Inch Carbine-Gas 1-in-8 .223 Wylde AR-15 Freefloat Tubular M-LOK Pistol Full Build Kit

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 mil-spec charging handle, SB Tactical SBA5 pistol stabilizing brace, lower parts kit, mil-spec heavy-duty AR-15 6-position buffer tube, 3 oz standard carbine recoil buffer, standard AR-15 carbine recoil spring, and AR-15 M16 mil-spec receiver end plate. 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, aluminum
• Stripped AR-15 upper receiver, 7075 T6 aluminum, anodized finish
• 5.56 nitride bolt carrier group, 9310 alloy steel, nitride finish
• AR-15 mil-spec charging handle
• Micro low-profile gas block, 0.750 barrel diameter compatible
• SB Tactical SBA5 pistol stabilizing brace
• Steel flash can muzzle device, 1-in-2x28 thread pitch
• Mil-spec heavy-duty AR-15 6-position buffer tube
• Standard carbine recoil buffer, 3 oz
• Standard AR-15 carbine recoil spring
• AR-15 M16 mil-spec receiver end plate
• Lower receiver not included

Perfect For

• AR-15 pistol builders seeking a compact .223 Wylde configuration
• Gunsmiths sourcing a complete kit with the SB Tactical SBA5 brace
• 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 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 is constructed from aluminum and 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.

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 mil-spec charging handle is included as part of the upper operating components in this kit.

SB Tactical SBA5 Pistol Stabilizing Brace and Buffer System

The SB Tactical SBA5 pistol stabilizing brace is included as part of this full build kit. The buffer system consists of a mil-spec heavy-duty AR-15 6-position buffer tube, a 3 oz standard carbine recoil buffer, a standard AR-15 carbine recoil spring, and an AR-15 M16 mil-spec receiver end plate. Castle nut is included as a canonical full build kit component.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included.