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Description
Product Overview
Convert your standard FN PS90 into its authentic short-barreled rifle configuration with the CMMG 10.4" 5.7x28mm PS90 SBR Barrel Sub-Assembly. Precision-engineered to match original factory military-and-law-enforcement specs, this 10.4-inch barrel restores the iconic ultra-compact footprint and maneuverability of the FN P90 platform.
Constructed from heavy-duty 4150 Chrome Moly Vanadium (CMV) steel, the barrel features a chrome-lined bore and chamber for maximum corrosion resistance and rapid-fire durability. Treated with an exterior manganese phosphate coating, this medium-taper threaded barrel is built to withstand high-volume 5.7x28mm cycling and suppressor use.
NFA / SBR COMPLIANCE WARNING: Installation of a barrel under 16 inches in length onto an FN PS90 carbine converts the firearm into a Short-Barreled Rifle (SBR). This product is strictly subject to the regulations of the National Firearms Act (NFA). An approved ATF Form 1 (or Form 4) tax stamp is required prior to assembly.
Key Features
- Authentic 10.4" Length: Restores the original compact dimensions and balance of the factory FN P90/PS90 platform.
- 4150 CMV Steel Construction: Forged from high-grade 4150 Chrome Moly Vanadium steel for exceptional barrel life and thermal stability.
- Chrome-Lined Bore & Chamber: Premium hard chrome lining prevents velocity loss, erosion, and chemical corrosion from high-velocity 5.7x28mm loads.
- Manganese Phosphate Finish: MIL-SPEC exterior phosphate coating provides hard-wearing protection against moisture, abrasion, and friction.
- Factory Threaded Muzzle: Threaded specifically to accept CMMG PS90 thread adapters and flash hiders for suppressor or muzzle device integration.
- Medium Taper Contour: Rigorous medium profile maintains accuracy without adding excess weight to the front end.
Specifications
| Brand / Manufacturer | CMMG |
|---|---|
| MPN / SKU | 57DF1C7 |
| Caliber | FN 5.7x28mm |
| Firearm Compatibility | FN PS90 Series (SBR Conversions) |
| Barrel Length | 10.40 in. |
| Contour / Profile | Medium Taper |
| Material | 4150 Chrome Moly Vanadium (CMV) Steel |
| Bore & Chamber Finish | Chrome Lined |
| Exterior Finish | Manganese Phosphate / Matte Black |
Frequently Asked Questions
Do I need ATF approval before installing this 10.4" barrel on my FN PS90?
Yes. Standard factory FN PS90 carbines come with a 16" barrel. Installing a barrel under 16 inches classifies the firearm as a Short-Barreled Rifle (SBR) under the National Firearms Act (NFA). You must receive an approved Form 1 or Form 4 tax stamp from the ATF prior to assembling this barrel into your receiver.
What muzzle thread pitch does this CMMG PS90 barrel have?
The barrel features metric M12x1 LH threads designed to mate with CMMG's PS90 Thread Adapter or factory P90 flash hiders. Using a CMMG thread adapter converts the muzzle to standard 1/2x28 threads for common US suppressors.
Why is a chrome-lined bore important for a 5.7x28mm barrel?
The 5.7x28mm round generates high chamber pressures and velocities. Chrome lining drastically increases wear resistance, extends barrel life under rapid fire, and makes cleaning carbon buildup out of the bore and chamber much easier.
Is special gunsmithing required to swap a PS90 barrel?
Removing the factory 16" PS90 barrel requires drilling out or cutting the factory shroud blind pin. Once the original barrel is removed, the CMMG 10.4" barrel drops into the standard PS90 receiver assembly. Professional gunsmith installation is recommended if you are unfamiliar with PS90 barrel removal techniques.
