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.
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