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Make: Palmetto State Armory (lower), AR57 (upper)
Model: PA-15, AR Five Seven
Serial Number: PA065585
Year of Manufacture: 2008-Present / ATF Classification: Modern
Caliber/Gauge: 5.7x28mm
Action Type: Semi automatic, direct blowback
Barrel Length: 16"
Sights/Optics: The front sight is a flip up Magpul MBUS iron sight. The rear is a Magpul MBUS adjustable aperture sight. There is a 5" section of picatinny atop the receiver and another 2" section at the front of the forend.
Grip/Stock Configuration & Condition: The upper receiver is an AR-57 LLC 5.7x28mm conversion that takes FN-PS90 / P90 magazines. The rails on the upper have MAGPUL ladder rail panels on the sides and a Troy rail cover on the bottom. The muzzle device is a GEMTECH Suppressors flash hider. The pistol grip is made by ERGO Grips. The stock is an adjustable MAGPUL ACS stock. The LOP measures 14.5" at full extension from the face of the trigger to the rear of the butt. The furniture shows minimal handling wear. There are no chips or cracks. This furniture rates in Excellent condition.
Type of Finish: Matte black
Finish Originality: Original
Bore Condition: The bore is bright and the rifling is sharp with some stubborn fouling. There is no erosion in the bore. In this writer's opinion, the bore rates 9/10.
Overall Condition: This rifle retains about 99% of its metal finish. There are minimal marks other than a light scratch on the right side of the barrel and subtle operational wear. The pins are unmarred and remain fully functional. The markings are clear and complete. Overall, this rifle rates in about Fine+ condition.
Mechanics: The action functions correctly. We did not fire this firearm. As with all used firearms, a thorough cleaning may be necessary to meet your maintenance standards.
Box, Paperwork & Accessories: Iron sights, rail covers, and a polymer 50rd magazine
Our Assessment: This is a very high condition modern AR configuration that pairs a PSA PA-15 lower with the distinctive AR-57 upper receiver. Approximately 99% of the original matte finish remains, with clean, even exterior surfaces and only minimal handling evidence. The rifle presents a crisp, contemporary appearance consistent with careful use and storage.
Mechanically, the rifle is sound. The bore rates 9 out of 10 with strong rifling and good brightness. The action functions correctly and reflects the AR-57 operating concept, which feeds from P90 pattern magazines mounted on top of the receiver and ejects spent cases downward. This configuration offers reliable operation with the 5.7x28mm cartridge while maintaining standard AR lower controls and ergonomics.
The AR-57 system gained popularity for its unique magazine placement, soft recoil impulse, and compatibility with common AR-15 lowers. In a 16" configuration, the platform allows the cartridge to achieve solid velocity and practical accuracy. As configured, this rifle represents a clean and well preserved example of a modern hybrid AR build, combining the versatility of the PA-15 lower with the distinctive functionality of the AR-57 upper.