Primary Weapons Systems Uxr 308 Winchester 16'' Barrel Conversion Kit

The Primary Weapons Systems UXR 308 Winchester 16" barrel conversion kit brings modular rifle versatility to shooters who want to switch calibers without buying a whole new gun. Built around PWS's XChange system, this kit lets you swap barrel, bolt, and magwell to adapt your rifle to different loads and scenarios—from precision rifle work to hunting to suppressed shooting. It's the kind of practical flexibility that appeals to serious shooters who demand adaptability without the cost or complexity of managing multiple complete rifles.

The XChange system uses an intuitive dot-matching design: line up the corresponding dots on your conversion components, and they fit together correctly every time. No guessing, no fitting and forcing parts that don't belong. The 16" barrel length strikes a balance between handling and velocity, making this kit useful for intermediate-range work and shooting in tighter spaces where a longer barrel becomes unwieldy. Whether you're building a compact rifle, testing a new caliber before committing to a full build, or keeping your platform flexible for changing seasons and game, this conversion approach eliminates the friction of traditional platform hopping.

PWS has designed the UXR ecosystem with expansion in mind, so the caliber and barrel length options are expected to grow over time. If you already own a UXR upper or are building one, this 308 Winchester conversion kit turns your rifle into a multi-caliber platform without reinvesting in a complete new firearm.

Key Features

• 308 Winchester caliber conversion for XChange-compatible UXR platforms
• Includes barrel, bolt, and magwell for complete caliber swap
• Dot-matching system ensures correct alignment and error-free assembly
• 16" barrel length for balanced handling and velocity
• Designed for future expansion of additional calibers and barrel lengths

Specifications

Frequently Asked Questions

What rifles is this conversion kit compatible with?

This kit is designed for Primary Weapons Systems UXR platforms that use the XChange system. You'll need a compatible UXR upper receiver and lower to use this conversion kit.

How do I know the parts fit together correctly?

The XChange system uses a dot-matching design. Simply align the corresponding dots marked on the barrel, bolt, and magwell, and the components will fit together correctly every time.

What's included in this conversion kit?

The kit includes the 308 Winchester barrel, bolt, and magwell—everything you need to convert a compatible UXR platform to 308 Winchester caliber.

Can I use other barrel lengths with this caliber?

Primary Weapons Systems plans to expand the UXR catalog with additional caliber options and barrel lengths in the future. Check back for updates on 308 Winchester availability in other lengths.