PS90® Accessories

FN PS90® Accessories & Upgrades Overview

FN PS90® accessories and upgrades at FN Specialties include barrels, rails, optics mounts, muzzle devices, and slings. Our curated collection helps you customize your PS90® for performance and tactical versatility. Whether you are setting up a short-barreled rifle conversion or enhancing your factory carbine, we carry the right accessories to get the job done.

FN PS90® Barrel Accessories

For shooters pursuing an SBR configuration, the CMMG 10.4" Barrel is the go-to option for shortening the PS90®. Pair it with the CMMG Thread Adapter, which attaches to the barrel’s M12 x 1.0 left-hand threads and provides proper clearance for reliable operation. This setup is the standard foundation for building a PS90® SBR.

Note: The PS90® uses a muzzle device for barrel retention. All NFA rules apply when converting to a short-barreled rifle.

FN PS90® Rails & Mounting Solutions

Expand your PS90® with precision rails that add modern mounting capability without compromising ergonomics. Two highly recommended options are:

• P90/PS90 Side Picatinny Rail with Hardware — A premium option inspired by the original FN design, featuring countersunk screws that provide a rock-solid fit and help maintain zero when mounting lights or lasers.
• P90/PS90 Picatinny 1913 Mount with QD Sockets — Provides a rock-solid top mounting solution with integrated QD sockets for sling attachment.

Both options integrate cleanly with the PS90® platform, giving you flexible attachment points for optics, lights, or sling setups.

FN PS90® Optics & Sights

Upgrading optics improves speed and accuracy on target. Choose from red dots, holographic sights, or night sights in our Optics, Lights & Lasers collection. Popular choices include compact red dots for fast acquisition and Trijicon night sights for low-light shooting. Our mounting solutions ensure proper fitment to the PS90® platform.

FN PS90® Muzzle Devices

The PS90® requires a muzzle device for barrel retention, and FN Specialties carries a selection designed to fit factory and short barrels. Browse PS90® Muzzle Devices to find the correct option for your build.

FN PS90® Slings

A proper sling setup keeps the PS90® controlled and ready without adding bulk. FN Specialties offers QD non-bungee slings that we recommend for use with the PS90®. With QD attachment points available, these slings provide a secure connection and smooth handling. They pair well with the compact bullpup design, ensuring comfort and quick transitions between carry positions.

Professional Installation Services

Proper installation ensures safety and performance. FN Specialties offers professional installation services for PS90® barrel conversions and rail upgrades. Contact us for FFL-qualified installation support on select services.

Upgrade Your FN PS90® with FN Specialties

FN PS90® upgrades and accessories from FN Specialties provide precision, reliability, and tactical versatility. Browse short-barrel kits, recommended rails, muzzle devices, optics, and QD slings to customize your PS90® for any shooting environment.