Davidson Defense Phalanx 16-inch Carbine-Gas 1:7 5.56 NATO AR-15 Freefloat M-Lok Handguard Rifle Upper Build Kit

Phalanx 16-inch Carbine-Gas 1:7 5.56 NATO AR-15 Freefloat M-LOK Upper Build Kit

The Phalanx is a 5.56 NATO AR-15 Upper Build Kit built around a 16-inch carbine-length gas platform. The kit centers on a 16-inch government profile barrel in 4150 CrMoV steel with a nitride finish, 1:7 twist rate, and 1/2x28 thread pitch, paired with an A2 birdcage flash hider and a black crush washer. A micro low-profile steel gas block at 0.750 diameter and a carbine-length stainless steel gas tube are included on the front end. The upper receiver is a 7075-T6 aluminum design with an anodized finish, M4 feed ramps, an ejection port cover, and a forward assist, paired with a 15-inch freefloat M-LOK handguard in black with a full-length Picatinny top rail. BCG and charging handle are not included.

Key Features

• 16-inch government profile barrel, 4150 CrMoV steel, nitride finish, 1:7 twist, 1/2x28 thread pitch, 5.56 NATO
• Carbine-length gas system
• Carbine-length stainless steel gas tube
• Micro low-profile steel gas block, 0.750
• A2 birdcage flash hider, 1/2x28, black crush washer included
• 7075-T6 aluminum upper receiver, anodized, M4 feed ramps, ejection port cover, forward assist
• 15-inch freefloat M-LOK handguard, black, full-length Picatinny top rail
• BCG and charging handle not included

Perfect For

• Builders sourcing a complete 5.56 NATO AR-15 upper build kit with a 4150 CrMoV nitride government profile barrel and 15-inch freefloat M-LOK handguard, pairing it with their own bolt carrier group and charging handle
• Shooters building a 16-inch carbine-gas 5.56 NATO platform who prefer to select their own BCG while having the nitride barrel, stainless steel gas tube, and freefloat M-LOK handguard covered in one kit
• AR-15 builders who want a 4150 CrMoV nitride government profile barrel with a micro low-profile gas block and full-length Picatinny top rail handguard without sourcing components separately

Barrel and Muzzle Device

The 16-inch government profile barrel is chambered in 5.56 NATO and constructed from 4150 CrMoV steel with a nitride finish. The twist rate is 1:7 and the thread pitch is 1/2x28, which matches the included A2 birdcage flash hider. A black crush washer, a micro low-profile steel gas block at 0.750 diameter, and a carbine-length stainless steel gas tube cover the front end gas configuration on this carbine-length platform.

Upper Receiver and Handguard

The 7075-T6 aluminum upper receiver carries an anodized finish with M4 feed ramps, an ejection port cover, and a forward assist. The 15-inch freefloat M-LOK handguard is black with a full-length Picatinny top rail and M-LOK attachment points along the body for accessory mounting. These two components define the exterior structure of the upper assembly on this AR-15 platform.

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