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

Harbinger 11.5-Inch Carbine-Gas 1-8 .223 Wylde AR-15 Freefloat Tubular M-LOK Handguard Pistol Complete Upper

This is a complete AR-15 upper chambered in .223 Wylde, built on a 7075-T6 aluminum upper receiver with a black anodized finish and M4 feed ramps. The upper includes a standard forward assist assembly and a black aluminum AR-15 ejection port door assembly. The 11.5-inch government profile barrel is KAK Industry 4140 CrMoV steel with a nitride finish and a 1-8 twist rate, threaded at 1-2x28. The 12.5-inch tubular freefloat M-LOK aluminum handguard covers the front end with a suppressor ready design. A complete AR-15 bolt carrier group made in the USA and an M4 Mil-Spec charging handle are included, completing the upper component set.

Key Features

• .223 Wylde chambering, 11.5-inch government profile KAK Industry 4140 CrMoV steel barrel, nitride finish
• 1-8 twist rate, 1-2x28 thread pitch, .750 inch gas block journal
• Carbine-length gas system with carbine-length stainless steel gas tube
• Micro low-profile steel gas block, .750 inch
• 7075-T6 aluminum upper receiver, black anodized, M4 feed ramps
• Black aluminum AR-15 ejection port door assembly
• Standard AR-15 forward assist assembly
• 12.5-inch tubular freefloat M-LOK aluminum handguard, suppressor ready design, 1.77-inch internal diameter, full-length top rail
• Complete AR-15 bolt carrier group, made in the USA, 9310 alloy steel bolt head, 8620 alloy steel body, nitride finish, .223 Rem, 5.56 NATO, .300 BLK, .350 Legend compatible
• AR-15 M4 Mil-Spec charging handle, anodized
• Steel Flash Can Design 11 Rev 2 Pattern 2, black oxide finish, 1-2x28 thread pitch, 9mm compatible
• Black 1-2-inch crush washer

Perfect For

• AR-15 builders pairing a complete .223 Wylde pistol upper with an existing lower
• Shooters adding an 11.5-inch upper to an AR-15 lower they already own
• Builders who want a BCG and charging handle included with the upper assembly

Upper Receiver and Barrel

The upper receiver is 7075-T6 aluminum with a black anodized finish and M4 feed ramps. It includes a standard forward assist assembly and a black aluminum ejection port door assembly. The 11.5-inch government profile barrel is KAK Industry 4140 CrMoV steel with a nitride finish, chambered in .223 Wylde with a 1-8 twist rate and a 1-2x28 thread pitch. The gas system is carbine-length, with a carbine-length stainless steel gas tube and a micro low-profile steel gas block at .750 inch.

Tubular Freefloat M-LOK Handguard

The handguard is a 12.5-inch tubular freefloat M-LOK unit in aluminum, covering the forend of the upper assembly. It features a suppressor ready design with a 1.77-inch internal diameter and a full-length top rail. The tubular profile and internal diameter accommodate suppressor use at the handguard level.

Bolt Carrier Group and Charging Handle

The included bolt carrier group is a complete AR-15 unit made in the USA, with a 9310 alloy steel bolt head and an 8620 alloy steel body, both finished in nitride. It is compatible with .223 Remington, 5.56 NATO, .300 Blackout, and .350 Legend. An AR-15 M4 Mil-Spec charging handle with an anodized finish is also included. These two components complete the upper component set alongside the upper assembly, barrel, and handguard.

Muzzle Device

The upper includes a Steel Flash Can Design 11 in Rev 2 Pattern 2 with a black oxide finish, threaded at 1-2x28 and noted as 9mm compatible. A black 1-2-inch crush washer is included as part of the muzzle device hardware. The black oxide finish on the flash can is consistent with the overall finish profile of this upper.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws.