Description
This is the large-frame magwell piece of the PWS UXR XChange system, sized for the longer cartridges the platform runs. The UXR is built around one serialized receiver that lets you jump between calibers by changing just three parts: the barrel, the bolt head, and this magwell. Snap this one in with the matching 308 or 6.5 Creedmoor barrel and bolt, and your rifle is set up for the heavies without ever touching the serialized lower.
What the UXR Magwell Actually Does
The magwell is molded from polymer and shaped on the outside to accept AR10/SR25 pattern magazines, which is the standard feed system for 308 Winchester and 6.5 Creedmoor rifles. Both of those rounds share the same case head and overall length, so a magazine built for one feeds the other just fine. That means the same D&H, Magpul, or Lancer mags you already own will run in this magwell no problem.
Ambidextrous by Design
PWS built the whole UXR for lefties and righties alike, and this magwell carries that through with an ambidextrous release setup. Whichever side you run your controls on, the magwell keeps up. It's a small detail that makes a real difference if you shoot from either shoulder or share the rifle across a household.
Matching the Dots for a Clean Swap
One of the smarter touches on the UXR is the dot-marking system. Each magwell and bolt is stamped with corresponding dots, and the barrels are marked with caliber and twist rate, so you match a magwell dot to a bolt dot and grab the right barrel. It takes the guesswork out of a caliber change and keeps you from mixing up parts on the bench. For anyone building out a UXR that can wear multiple calibers, this magwell is the piece that opens the door to the 308 and 6.5 Creedmoor side of the system.
Key Specifications
- Manufacturer: Primary Weapons Systems
- Model: UXR
- Manufacturer Part Number: UXR-MW-AR10
- UPC: 811154033017
- Compatible Calibers: 308 Winchester / 6.5 Creedmoor
- Frame Size: Medium / AR10 (Large Magwell)
- Magazine Pattern: AR10 / SR25
- Material: Polymer
- Color: Black
- Handedness: Ambidextrous
- System: UXR XChange
What’s Included
- PWS UXR magwell assembly (308 Winchester / 6.5 Creedmoor, black)
Frequently Asked Questions
What magazines does the PWS UXR 308/6.5 Creedmoor magwell take?
This magwell is sized on the outside for AR10/SR25 pattern magazines, which is the common feed standard for 308 Winchester and 6.5 Creedmoor. Since both cartridges share the same case dimensions and length, a mag built for one will run the other. Brands like D&H, Magpul PMAG, and Lancer are popular choices that work with this setup.
Do I need anything else besides this magwell to change calibers on my UXR?
Yes. The UXR XChange system changes calibers by swapping three parts: the magwell, the bolt head, and the barrel. This piece covers the magwell side for 308 and 6.5 Creedmoor, so you'll also need the matching bolt and a barrel in the caliber you want before your rifle is ready to run.
Is the UXR magwell ambidextrous?
It is. PWS designed the entire UXR platform for both left and right handed use, and this magwell follows that with an ambidextrous magazine release. That makes it a good fit if you shoot from either shoulder or if more than one person runs the rifle.
How do I know I'm matching the right parts when I install it?
PWS uses a dot-marking system to keep swaps foolproof. The magwell and bolt each carry corresponding dots, and the barrels are marked with caliber and twist rate. You just line up the dot on the magwell with the dot on the bolt and grab the barrel labeled for your caliber.





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