Adams Arms AR-15 P1 Gas Piston Upper Receiver Assembly 5.56x45mm NATO 16” Barrel

Upgrade your standard AR-15 rifle with the Adams Arms AR-15 P1 Gas Piston Upper Receiver Assembly. Built for shooters seeking high-volume reliability without the carbon buildup of traditional direct impingement systems, this 16-inch complete upper assembly in 5.56x45mm NATO features Adams Arms’ signature short-stroke gas piston operating system for cleaner, cooler, and smoother operation.

The P1 baseline upper is engineered with a durable melonite-finished 16-inch barrel, mid-length piston drive, and an ergonomic handguard setup, making it an exceptional choice for tactical training, home defense, and high-volume range sessions. By venting hot gases away from the bolt carrier group and upper receiver, the Adams Arms P1 system drastically reduces cleaning downtime, receiver fouling, and component wear.

• Caliber: 5.56x45mm NATO (.223 Remington compatible)

• Barrel Length: 16 Inches

• Gas System: Short-Stroke Gas Piston System (Mid-Length)

• Handguard: Ergonomic Mid-Length Handguard

• Upper Receiver: Precision Forged 7075-T6 Aluminum

• Finish: Corrosion-resistant Melonite/Nitride barrel treatment

• Use Case: AR-15 rifle builds, duty setups, tactical range training, and low-maintenance shooting

Features

Magpul MOE handguard
16″ QPQ melonite barrel
A2 flash hider