PSA PA-15 AR Pistol with AR57 11-inch 5.7x28mm Top-Feed Upper, Side Charging, Bottom Eject, Quad-Rail
This custom PSA PA-15 pairs a Palmetto State Armory lower with an AR57 11-inch 5.7x28mm top-feed upper for a distinctive, high-capacity AR-pattern pistol. It accepts PS90 magazines, feeds from the top, and ejects through the AR-15 magwell. The setup features straight-blowback operation, a threaded barrel with an A2-style flash hider, and an aluminum quad-rail handguard with a full-length top Picatinny rail. Condition is very good with an excellent, mirror-bright bore.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are some mild scuffs and wear.
What’s Included
- PSA PA-15 AR pistol with AR57 11-inch 5.7x28mm top-feed upper installed
- 1x 50-round PS90-pattern top-feed magazine (polymer body marked "5.7x28" with 10/25/50 witness marks)
The AR57 system positions the magazine on top and routes spent cases out through the AR-15 magwell, delivering top-feed loading with bottom ejection. This configuration accepts PS90 magazines and is noted for a 50+1 capacity with the included 50-round mag. Side charging with bottom eject is integral to this design and called out on this build.
The 11-inch barrel is threaded and fitted with an A2-style flash hider. The upper runs a straight-blowback action tailored to the 5.7x28mm cartridge, offering a simple operating system with minimal moving parts in the upper.
Controls are familiar and functional. A manual safety selector is present on the PSA PA-15 lower. The upper includes a side charging knob while also retaining the standard AR-style rear charging handle, providing two charging methods.
The aluminum quad-rail handguard provides a full-length 12 o'clock Picatinny rail and additional rail sections at 3, 6, and 9 o'clock for accessory mounting. No sights or optics are installed, allowing the next owner to set it up to preference.
Receivers are aluminum with a matte black anodized finish for a uniform look across the build. This full-size AR-15 platform pistol keeps the familiar AR lower ergonomics while leveraging the unique AR57 top-feed, bottom-eject system in 5.7x28mm.