XF50 Slick Side PS90 Billet Upper Receiver
Transform your PS90 with the XF50 Slick Side (formerly Effen 90 Slick Side) billet upper receiver. This serialized component replaces the factory FN receiver and provides a streamlined, minimalist profile. Perfect 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 for superior rigidity
- Available finishes: Type III hard coat anodized (black) or Type II anodized (grey/natural Cerakote)
- Marked 5.7×28 for authenticity
Slick Side Profile
The Slick Side design removes excess bulk while maintaining strength, delivering a lighter and cleaner appearance. Ideal for those who want a minimalist aesthetic without sacrificing performance.
Designed for Compatibility
The XF50 Slick Side Upper Receiver is a stripped component that accepts standard FN PS90 parts. It uses the same action and lower assembly as the regular PS90. Transfer parts from your OEM receiver or purchase an optional parts kit to complete assembly.
Ideal for SBR Builds
When paired with a CMMG 10.4″ Barrel, this billet receiver is the perfect foundation for NFA-regulated SBR builds. Stronger than the factory cast receiver and significantly lighter, the Slick Side offers unmatched simplicity.
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
Need full rail capability? Check out the XF50 Tri-Rail 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.
