CMMG 10.4" 5.7x28mm Barrel for FN PS90, 1:9 Twist, 4150 Chrome Moly, Black

Building a PS90 SBR that actually looks the part means starting with the right barrel. The CMMG 10.4" 5.7x28mm barrel for FN PS90 is purpose-built for SBR builds, giving you the compact profile that makes sense for this platform while maintaining proper powder-burn efficiency and reliability. At 10.4 inches, it's the proper length for a regulated short-barreled rifle configuration—no awkward proportions, no compromise on handling. Whether you're assembling your first SBR or refining an existing build, this barrel delivers the foundation your PS90 project needs.

Constructed from 4150 chrome moly steel with a salt-bath nitride finish, this barrel is built to handle the 5.7x28mm round day in and day out without fretting or accelerated wear. The nitride treatment also guards against corrosion in the field or range bag, keeping your barrel in service-ready condition. The 1:9 twist rate is engineered for the 5.7x28mm cartridge, ensuring stable, accurate flight regardless of your ammo selection. M12x1.0 left-hand threads at the muzzle accept PS90 flash hiders and thread adapters, so you can dress it up with suppressors, brakes, or other muzzle devices once your build is complete.

This is a bare barrel—just the core component you need for your build. Pair it with the right bolt carrier group, handguard, stock, and fire control group to complete your PS90 SBR. CMMG's focus on the PS90 platform means this barrel is designed with that specific receiver in mind, making fitment straightforward for anyone tackling a modern rifle build.

Key Features

• 10.4" barrel length optimized for PS90 SBR builds
• 4150 chrome moly steel construction with salt-bath nitride finish for durability and corrosion resistance
• 1:9 twist rate matched to 5.7x28mm ballistics
• M12x1.0 left-hand threaded muzzle for flash hiders and suppressors
• Purpose-designed for FN PS90 platform compatibility

Specifications

Frequently Asked Questions

Will this barrel fit my FN P90 or PS90?

This barrel is designed for the FN PS90 platform. Verify your specific receiver and bolt carrier compatibility before ordering, as SBR conversions require precise matching of components.

What do the M12x1.0 LH threads accept?

The left-hand threads at the muzzle accommodate PS90-specific flash hiders, muzzle brakes, thread adapters, and suppressors designed for this platform. Check the specs of any muzzle device before purchase to ensure the thread pitch and direction match.

Do I need an FFL transfer or Form 1 to use this barrel?

This is a bare barrel component. Regulations governing short-barreled rifles vary by jurisdiction. Consult your local and federal requirements, and work with a licensed gunsmith or FFL if you're unsure whether your build requires NFA registration or other legal compliance steps.

What ammunition should I use with the 1:9 twist?

The 1:9 twist rate is engineered for 5.7x28mm ammunition. Use factory 5.7x28mm rounds; do not attempt to chamber other calibers in this barrel.