New 338 ARC PSA Complete Upper

Published on August 17, 2025
Duration: 11:05

This review covers the new 338 ARC cartridge and a Palmetto State Armory (PSA) complete upper assembly designed for it. The 338 ARC offers approximately 1.5 times the energy of 300 Blackout with heavier projectiles, fitting within an AR-15 lower receiver. The PSA upper features an 8.5-inch barrel, pistol-length gas system, and is optimized for suppressed use and close-quarters applications.

Quick Summary

The 338 ARC cartridge offers approximately 1.5 times the energy of 300 Blackout, utilizing heavier 300-grain projectiles. This makes it a potent option for hunting larger game or close-quarters applications, fitting within a standard AR-15 lower receiver.

Frequently Asked Questions

What is the main advantage of the 338 ARC cartridge over 300 Blackout?

The primary advantage of the 338 ARC is its significantly higher energy on target, approximately 1.5 times that of 300 Blackout, due to its use of heavier projectiles like 300-grain bullets.

What are the key specifications of the PSA 338 ARC complete upper?

The PSA 338 ARC upper features an 8.5-inch barrel made of 4150 Chromoly Vanadium steel, a pistol-length gas system, a 1:8 twist rate, and a threaded 5/8x24 muzzle for suppressor or brake attachment.

Is the 338 ARC compatible with standard AR-15 lowers?

Yes, the 338 ARC cartridge is designed to fit within an AR-15 lower receiver, allowing users to easily convert their existing platforms by simply swapping the upper receiver assembly.

What type of suppressor should be used with the 338 ARC?

Due to the wider bullet diameter of the 338 ARC, a 30 caliber suppressor is not recommended. Instead, use suppressors rated for 9mm or .45 caliber to avoid baffle strikes.

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