The FN PS90 is a 5.7x28mm semi-automatic rifle in a bullpup configuration. Its 16-inch barrel fits inside a compact overall package, and the 50-round magazine gives it a capacity well above most semi-automatic rifles in its class. 
 

Key Specifications 

• Caliber: 5.7x28mm 
• Action: Semi-Automatic 
• Capacity: 50+1 rounds 
• Barrel Length: 16 inches 
• Weight: 6.25 lbs 
• Finish: Matte Black 
   

Detailed Features 

The bullpup layout places the action behind the trigger, which allows a 16-inch barrel in a rifle shorter than most traditional carbines. The closed bolt blowback system cycles reliably and produces minimal recoil, which keeps muzzle movement manageable during rapid fire. 
 
The cold hammer-forged barrel is chrome-lined for longevity. Ambidextrous safety and magazine release accommodate left-handed shooters without additional parts. Backup iron sights and a MIL-STD accessory rail are standard -- the rail accepts lights, red dots, and other accessories. 
 

Usage Scenarios 

• Home Defense: Compact overall length and 50-round capacity make it practical in confined spaces. 
• Sport Shooting: Low recoil supports fast follow-up shots in timed formats. 
• Tactical Use: The high-capacity magazine and lightweight build (6.25 lbs) suit dynamic, close-range scenarios.

The FN PS90 Bullpup in 5.7x28mm draws a distinctive fan base that tends to be enthusiastic about its unique characteristics.

The bullpup configuration is the first thing discussed. The compact overall length without sacrificing barrel length is genuinely useful, and owners who value maneuverability in tight spaces consistently mention it as a primary reason for choosing the PS90.

The 50-round magazine is a standout feature -- almost universally mentioned as a significant advantage. For home defense or sustained shooting drills, the capacity is difficult to match in a rifle this size.

Low recoil from the 5.7x28mm cartridge makes the PS90 approachable for new shooters and pleasant for high-volume sessions. The futuristic appearance also draws collectors and enthusiasts who appreciate a distinctive platform.

Ammunition cost and availability are the most persistent criticisms. The 5.7x28mm round is more expensive and harder to find than 9mm, .223, or other common calibers, which raises the long-term cost of ownership considerably.

Ergonomics split opinion. The bullpup layout puts controls in different positions than traditional rifles, and some shooters find the adjustment period longer than expected. Left-handed operation is addressed with ambidextrous controls, but the transition from traditional layouts takes time.

Aftermarket accessories are more limited compared to AR-15 platforms. Holsters, stocks, and upgrade parts exist but require more searching.

For strictly long-range or hunting applications, most owners acknowledge the PS90 is better suited to close-range work, which limits its versatility compared to more traditional rifle platforms.