Ruger 90739 Threaded Barrel Kit - 5.7x28mm, 4.49" Black Nitride Finish

The Ruger 90739 Threaded Barrel Kit for 5.7x28mm gives your Ruger-57 a clean, factory-backed upgrade path to suppressor-ready performance. This is genuine Ruger factory hardware—not an aftermarket substitute—engineered for the exact tolerances and reliability your pistol demands. The 4.49" barrel comes finished in black nitride, a hard-wearing protective coating that resists corrosion and wear while maintaining that tactical aesthetic. If you're running suppressed .57 ammo or just want the option to add a muzzle device down the road, a threaded barrel is the first real step.

Installation is straightforward: no gunsmithing, no special knowledge required. The barrel swaps in quickly, and Ruger includes everything you need in the kit—thread protector, adapter, and the correct wrench. The 1/2"-28 threads are the standard Class 2A specification, so you have broad compatibility with suppressors and other muzzle devices on the market. That level of access matters when you want to experiment with different setups without hunting for proprietary adapters or worrying about fitment surprises.

Built from stainless steel and treated with that durable black nitride finish, this barrel handles both range sessions and field use without fussing. Whether you're a dedicated 5.7x28 enthusiast, a suppressor owner looking to standardize your kit, or just someone who wants factory reliability with modern tactical capability, this is a no-nonsense upgrade that delivers exactly what it promises.

Key Features

• Genuine Ruger factory-manufactured threaded barrel—designed and tested by the maker
• 1/2"-28 threads (Class 2A) accept standard suppressors and muzzle devices
• Black nitride finish for corrosion resistance and durability
• Drop-in installation with no gunsmithing required
• Kit includes thread protector, adapter, and installation wrench
• Compatible with Ruger-57 pistols

Specifications

Frequently Asked Questions

Will this threaded barrel work with my suppressor?

The barrel is threaded 1/2"-28 (Class 2A), the standard specification for most modern suppressors. Check your suppressor's thread specification to confirm, but chances are very good it will mount directly without adapters.

Do I need a gunsmith to install this?

No. Ruger designed this as a drop-in replacement barrel for the Ruger-57. The kit includes a wrench and all necessary components. Installation is quick and straightforward without special tools or expertise.

What comes in the kit?

The kit includes the threaded barrel itself, a thread protector, an adapter, and the installation wrench. You have everything you need to install and protect the threads right out of the box.

Is this compatible with the Ruger-57?

Yes. This barrel kit is engineered specifically for Ruger-57 pistols and is a genuine Ruger factory accessory.