Davidson Defense Infantry 16-inch Carbine-Gas 1:7 5.56 NATO AR-15 M-Lok Rifle Complete Upper Build

Infantry 16-inch 5.56 NATO AR-15 Complete Upper

The Infantry is built around a 16-inch 5.56 NATO barrel with a medium profile, paired with a 7075-T6 aluminum upper receiver finished in black anodizing. It pairs a 15-inch Air Lite Series M-LOK free-floating handguard with a tanker-style three-port muzzle brake at the muzzle, running on a carbine-length gas system. A complete bolt carrier group and Mil-Spec charging handle round out the upper, giving the buyer everything needed on the upper side.

Key Features

• 16-inch 5.56 NATO barrel, 1:7 twist, Nitride finish
• Carbine-length gas system with micro low-profile steel gas block
• 7075-T6 aluminum upper receiver, black anodized finish
• Air Lite Series 15-inch M-LOK free-floating handguard with continuous Picatinny top rail
• Tanker-style three-port muzzle brake, black
• Complete bolt carrier group and Mil-Spec charging handle included

Barrel and Gas System

The barrel runs 16 inches long, chambered in 5.56 NATO and built from 4150 chrome moly vanadium steel with a nitride finish and medium profile. It carries a 1:7 twist rate, well suited to stabilizing heavier 5.56 bullet weights, along with a 1/2x28 muzzle thread. Gas cycles back to the action through a carbine-length system, running a stainless steel carbine-length gas tube and a micro low-profile steel gas block sized to a .750-inch journal.

Upper Receiver and Handguard

The upper receiver is machined from 7075-T6 aluminum and finished in black anodizing, cut with M4 feed ramps for smooth feeding and fitted with a standard AR-15 forward assist assembly. The ejection port carries a standard .223/5.56 door with its rod and spring installed. Over the barrel sits a 15-inch Air Lite Series M-LOK free-floating handguard finished in black, with a continuous Picatinny top rail running along its length.

Muzzle Device

Capping the muzzle is a tanker-style three-port muzzle brake finished in black, with a .300-inch bore diameter sized for 5.56 NATO. It threads onto the barrel's 1/2x28 pattern and is secured with the included 1/2-inch black crush washer.

Bolt Carrier Group and Charging Handle

A complete AR-15 bolt carrier group is included, made in the USA and listed for use across 5.56 NATO, .223 Remington, .300 Blackout, and .350 Legend. That broader listing describes the BCG itself; the barrel and chambering on this upper remain 5.56 NATO. A Mil-Spec AR-15 M4 charging handle rounds out the upper's operating components.

Follow all manufacturer instructions and safe handling practices.

Ensure compliance with all applicable federal, state, and local laws.