XF50 Tri-Rail PS90 Billet Upper Receiver
Enhance your PS90 with the XF50 Tri-Rail (formerly Effen 90 Tri-Rail) billet upper receiver. This serialized component replaces the factory FN upper and delivers a lightweight, stronger, and feature-rich platform for your next PS90 SBR project.
Premium Billet Construction
- Precision CNC machined from billet 6061 aluminum
- Weighs 14.8 oz — 35% lighter than the factory FN receiver
- Monolithic single-piece construction with integral 12-lug Picatinny rail
- Available finishes: Type III hard coat anodized (black) or Type II anodized (grey/natural Cerakote)
- Marked 5.7×28 for authenticity
Optimized Design
The Tri-Rail profile offers maximum modularity, allowing you to mount optics and accessories with ease. Engineered from billet aluminum, it outperforms the factory cast receiver in strength and durability while reducing weight.
Designed for Compatibility
The XF50 Tri-Rail Upper Receiver is a stripped component that uses the same action and lower assembly as the standard PS90. You may transfer components from your factory receiver or use an optional parts kit to complete assembly. Fully compatible with standard FN PS90 parts.
Ideal for SBR Builds
Pair this billet receiver with a CMMG 10.4″ Barrel for an NFA-compliant SBR conversion. Complete your build with the correct PS90 muzzle device for proper barrel retention.
Related PS90 Enhancements
- CMMG 10.4″ Barrel for PS90 – common choice for SBR builds
- PS90 Muzzle Devices – required for proper barrel retention
- All PS90 Accessories – optics, rails, internals, and more
Prefer a minimalist look? See the XF50 Slick Side PS90 Upper Receiver.
Frequently Asked Questions
Is the XF50 receiver a complete upper?
No. The XF50 Tri-Rail and Slick Side are stripped billet receivers. You must transfer parts from your factory PS90 or use an optional parts kit to complete assembly.
Do I need an FFL to purchase?
Yes. The XF50 is a serialized firearm component. It must ship to a Federal Firearms Licensee (FFL) for transfer.
Can I use the XF50 for an SBR build?
Yes. The XF50 is ideal for NFA-compliant SBR projects. Pair it with a CMMG 10.4″ PS90 barrel and the correct PS90 muzzle device for proper assembly. All NFA rules apply.
What finishes are available?
Black receivers are Type III hard coat anodized; grey and natural/Cerakote receivers use Type II anodize.
Who manufactures the XF50?
The XF50 billet receiver line is manufactured in the USA by Imperial Arms Co., known for precision-machined PS90 and SCAR components.
Compliance Notice
This product is a serialized firearm component and requires transfer through a Federal Firearms Licensee (FFL). Shipping may take 5–7 business days. All NFA rules apply. Ensure compliance with federal and state laws before assembly.
