FN PS90 5.7x28mm Semi-Auto Bullpup, 16 in Chrome-Lined Barrel, Ported Brake, 50+1, Design Machine T-1 Top Plate
This FN PS90 is a civilian, semi-automatic bullpup carbine chambered in 5.7x28mm with fully ambidextrous controls and bottom ejection. It features a 16-inch cold hammer-forged, chrome-lined barrel with a ported muzzle brake, and includes a Design Machine USA T-1 top plate installed in the factory sight housing. The carbine feeds from top-mounted translucent rotary magazines and offers a 50+1 capacity in a compact, matte black package.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Minimal signs of prior use are present.
What's Included
- FN PS90 owner's manual
- 2 factory FN PS90 translucent polymer 50-round magazines
- Design Machine USA T-1 optic mounting plate (installed in factory sight housing)
- Small parts bag
The PS90 layout delivers compact handling with its bullpup stock, bottom ejection, and fully ambidextrous controls. The top-mounted translucent rotary magazine with a 90-degree feed supports a 50+1 capacity, keeping the firearm balanced and compact.
The 16-inch barrel is cold hammer-forged and chrome-lined, paired with a ported muzzle brake. This build emphasizes durability and consistent performance while maintaining a manageable overall length.
Operation is closed-bolt, straight blowback. Controls include an ambidextrous magazine release, ambidextrous charging handles, and an ambidextrous safety located in the trigger guard. The sliding trigger complements the bullpup configuration.
Materials and finish are purposefully selected: a matte black polymer stock and frame with an alloy receiver in matte black. The stock integrates a thumbhole grip and forward handstop. The carbine measures 26.23 inches overall, weighs 6.28 pounds, and has a 13.5-inch length of pull.
This example is custom-configured with a Design Machine USA T-1 top plate installed in the factory sight housing, providing a robust mounting solution. It also includes two factory 50-round magazines and the original FN PS90 owner's manual.