FN PS90 5.7x28mm Bullpup Rifle
About this product
The FN PS90 is a semi-automatic bullpup rifle chambered in 5.7x28mm that delivers a compact, controllable package optimized for personal defense and tactical use. Its bullpup layout places the action behind the trigger group, resulting in a 26.23-inch overall length despite housing a 15.75-inch barrel. This specific configuration from FN Herstal employs a closed-bolt, blowback-operated system with an ambidextrous control scheme, making it one of the most distinctive and space-efficient centerfire rifles available to civilians.
What is the FN PS90 used for?
The FN PS90 is designed for close-quarters personal defense, vehicle or structure security, and as a uniquely compact recreational firearm. Its primary ballistic advantage is firing the high-velocity, low-recoil 5.7x28mm cartridge, which offers excellent penetration against soft body armor within its 100-yard effective range. The bullpup configuration and 4.3-pound weight when loaded with a 50-round magazine make it exceptionally maneuverable in confined spaces, a primary reason it was originally adopted for personal defense weapon roles.
How does the FN PS90 compare to the Kel-Tec RDB?
The FN PS90 is more compact and ambidextrous than the Kel-Tec RDB, but chambered in a less common, more expensive caliber. The PS90 measures 26.23 inches overall, which is 3.1 inches shorter than the RDB, and its 5.7x28mm cartridge generates approximately 40% less felt recoil. However, the Kel-Tec RDB in 5.56 NATO is superior for long-range target shooting beyond 200 yards and uses far more affordable, widely available ammunition in the United States.
What does it weigh and what are the dimensions?
The FN PS90 weighs 6.28 pounds (2.85 kg) unloaded and measures 26.23 inches (666 mm) in overall length. Its key dimensional feature is the 15.75-inch (400 mm) hammer-forged, chrome-lined barrel housed entirely within the polymer stock, contributing to its short profile. The weapon stands 8.3 inches (211 mm) tall with the standard 50-round magazine inserted, giving it a profile comparable to a standard pistol-sized case, vastly different from traditional rifles like the Stevens 334 in .308 Win.
Who is this NOT for?
This rifle is not for budget-conscious shooters, hunters, or those seeking a traditional long-range platform. The 5.7x28mm ammunition averages $0.70 to $1.10 per round for quality defensive loads, making sustained practice expensive compared to 9mm or 5.56mm. Its effective range is limited to about 100-150 yards for point targets, making it unsuitable for most hunting applications where rifles like the Stevens 334 in .243 excel. Finally, its non-modular design offers limited aftermarket support for stock or handguard customization.
What's in the box?
The factory box includes the rifle with one standard 50-round translucent polymer magazine, a set of detachable backup iron sights, and a basic owner's manual with FN's warranty information. Unlike many modern sporting rifles, it does not include a cleaning kit, optic, or sling; FN assumes the end user will select their own optic for the integrated 1913 Picatinny rail. The manual specifically details the takedown procedure for the unique bullpup trigger linkage, a critical step for safe maintenance.
Is the FN PS90 worth it at $1699?
At $1699, the FN PS90 is worth it for collectors, bullpup enthusiasts, and shooters who prioritize extreme compactness for a specific defensive role. You are paying for FN's military-proven engineering, exceptional out-of-the-box reliability with factory SS195LF or SS197SR ammo, and a genuinely iconic design that has no direct domestic equivalent. The value proposition hinges on accepting the operational cost of its niche caliber; if your primary need is a budget-friendly, general-purpose rifle, this is not it.
Specs at a glance
Video review
Pros & cons
What works
- 26.23-inch overall length — 10+ inches shorter than an M4 with a comparable barrel.
- Integrated top Picatinny rail accepts any standard red dot or optic without adapters.
- True ambidextrous controls including safety, magazine release, and charging handles.
- Weighs 6.28 lbs unloaded — lighter than most 5.56mm carbines by over a pound.
Trade-offs
- Proprietary 5.7x28mm caliber ammunition costs $35-$55 for a box of 50 rounds.
- Bullpup trigger linkage creates a long, spongy pull averaging 8.5 pounds.
- No last-round bolt hold-open feature — you must manually check the chamber.
- Limited aftermarket support for stocks, handguards, or performance triggers.
Expert review
Key attributes
| upc | 845737002589 |
| manufacturer | FN America / FN Herstal |
| manufacturer part number | 3848950463 |
| action | Semi-Auto |
| atf type | MODERN SPORTING RIFLE |
| barrel length | 16" |
| caliber/gauge | 5.7 x 28 mm |
| capacity | 50 + 1 |
| color | No |
| length | 28.9500 |
| model | PS90 |
| number of magazines | 1 50 rd. |
| package height | 4.4 |
| package width | 10.5 |
| product type | Rifle |
| safety | Ambidextrous |
| shipping weight | 9.7 |
| sights | Backup Iron |
| sights type | Adjustable Sights |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
| state restriction (il) | NO SALE TO ILLINOIS PICA |
| state restriction (or) | NO SALE TO OREGON |
| state restriction (ri) | NO DIRECT SHIP TO RHODE ISLAND |
| state restriction (wa) | NO DIRECT SHIP TO WASHINGTON |
| units per box | 1 |
Frequently asked questions
- Is it compatible with standard AR-15 accessories?
- No, the FN PS90 uses a proprietary mounting system and is not compatible with standard AR-15 handguards, stocks, or triggers. The top rail is a standard MIL-STD 1913 (Picatinny) rail, so most optics and red dot sights will mount directly. For muzzle devices, the barrel uses a proprietary threading and collar system, requiring specific FN-made or aftermarket adapters for suppressor attachment.
- Does it fit in a standard rifle case?
- Yes, due to its 26.23-inch overall length, the PS90 fits in most standard 28-inch or larger pistol cases, not traditional rifle cases. A case like the Plano All Weather 42-inch model provides ample space for the rifle, spare magazines, and hearing protection. Its compact profile is a key logistical advantage over full-length firearms.
- How long does shipping take to an FFL?
- Ironclad Armory processes and ships in-stock firearms like the PS90 within 2 business days after receiving a copy of your chosen FFL's license. Transit time via FedEx or UPS Ground is typically 3-5 business days depending on your location. You will receive tracking information once the shipment is scanned by the carrier.
- Can I return it if it doesn't fit my needs?
- No, Ironclad Armory does not accept returns on firearms unless the item is defective and confirmed by our armorers. All firearm sales are final upon transfer at your FFL. We strongly recommend researching the 5.7x28mm platform, its ammunition cost (approx. $0.80/rd), and the bullpup manual of arms before purchasing. Contact us for specific fit or function questions prior to buying.
- Does this work with a binary or aftermarket trigger?
- No, the FN PS90 does not have a commercially available binary or significantly improved aftermarket trigger system. The trigger is part of a complex bullpup linkage running the length of the stock; its pull weight is typically 8-9 pounds as a deliberate safety feature of the design. Frankly, if you're looking for a light, crisp trigger for precision work, look at a traditional bolt-action platform.