FN Herstal PS90 TR 5.7x28mm Bullpup Semi-Auto, Triple Rail, 16.04 in CHF Chrome-Lined Barrel, Design Machine RMR Mount, Black
This FN Herstal PS90 TR stands out with its compact bullpup layout, cold-hammer-forged chrome-lined 16.04 inch barrel, and the TR (Triple Rail) configuration. It features bottom ejection, fully ambidextrous controls and charging handles, and a top-mounted translucent magazine system rated for 30+1. A Design Machine RMR optic mount is installed, and the original PS90 top Picatinny rail assembly is included detached, giving the buyer flexible sighting options.
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 a few mild scuffs and areas of light wear consistent with careful handling.
What’s Included
- Design Machine RMR optic mount (installed)
- Original PS90 top Picatinny rail assembly (detached)
- RMR-footprint micro optic mount plate (detached)
- Extended buttpad spacer stack (detached)
- 2x 30-round translucent PS90/P90-pattern polymer magazines
- 1x 10-round translucent PS90/P90-pattern polymer magazine
- Paperwork
The PS90 TR is the tri-rail variant with a MIL-STD-1913 top rail and side accessory rails for modular setup. On this example, a Design Machine RMR optic mount is installed for a low-profile micro optic solution. The original PS90 top Picatinny rail assembly is included detached, along with an RMR-footprint micro optic mount plate, allowing the next owner to configure the rifle to preference.
Its 16.04 inch cold-hammer-forged, chrome-lined barrel and closed-bolt blowback operation are designed for dependable function with the 5.7x28mm cartridge. The bottom-ejecting architecture aids true ambidexterity, complemented by ambidextrous safety and charging handles. The top-mounted translucent magazine system provides a clear visual on remaining rounds, with a stated maximum capacity of 30+1.
The compact bullpup platform yields an overall length of 26.23 inches with a 13.5 inch length of pull, offering a short, well-balanced package without sacrificing barrel length. This rifle includes an extended buttpad spacer stack (detached) for LOP tuning. The polymer stock features a thumbhole design and molded sling loop, paired with an alloy receiver and black finish throughout.
Factory markings include Fabrique Nationale Herstal BELGIUM and FNH USA FREDERICKSBURG VA on the receiver, aligning with the PS90’s documented origin and import.