Primal 5.56 NATO Pistol Upper

Primal 5.56 NATO Pistol Upper

This is a complete upper assembly built on the AR-15 platform with a 10.5-inch barrel designed for pistol configuration builds. The upper pairs a 4150 chrome moly nitride barrel with a 7075-T6 aluminum receiver, carbine-length gas system, and M4 handguard to create a compact, controllable platform suitable for short-range applications and home defense setups.

Key Features

• 10.5-inch 4150 chrome moly nitride barrel with 1:8 twist rate
• 7075-T6 aluminum upper receiver with M4 feed ramps
• Carbine-length stainless steel gas tube
• M4 profile nylon reinforced polymer handguard
• A2 front sight kit included
• AR-15 1/2x28 A2 birdcage flash hider
• Forward assist assembly and ejection port door

Compact Platform Design

The 10.5-inch barrel length positions this upper in the pistol configuration space, where overall length stays manageable while maintaining functional velocity for 5.56 NATO. The carbine-length gas system balances cycling reliability with a shorter sight radius compared to rifle-length setups. This configuration works well for shooters prioritizing maneuverability in confined spaces.

Barrel and Accuracy Profile

The 4150 chrome moly nitride barrel uses a 1:8 twist rate, which stabilizes a wide range of 5.56 ammunition from lighter 55-grain rounds to heavier 77-grain loads. Nitride finish provides corrosion resistance and durability without the cost of stainless steel. The M4 profile keeps weight down while maintaining structural integrity for the intended use case.

Handguard and Ergonomics

The carbine-length M4 handguard uses nylon reinforced polymer construction for a balance of durability and weight. Drop-in design means it attaches without special tools or modifications. The A2 front sight kit provides a fixed aiming reference without requiring additional mounting solutions.

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