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The Primary Weapons Systems UXR Conversion Kit gives your User XChange Rifle a 16-inch .223 Wylde setup without needing a whole second gun. The magic behind the UXR platform is that the serialized part is the receiver, so a caliber change comes down to swapping three components: the barrel, the bolt head, and the magazine well. This kit is the .223 Wylde piece of that puzzle, finished in black to match the rest of the rifle.
The .223 Wylde chamber is the sweet spot for this build. It splits the difference between .223 Remington and 5.56 NATO, running a tighter throat that squeezes better accuracy out of match ammo while still cycling standard 5.56 reliably. Paired with PWS's Boise-made precision barrels and the sub-MOA accuracy promise on quality ammunition, the 16-inch length gives you a versatile do-everything setup that works just as well punching paper at distance as it does in faster shooting.
Every UXR component is marked with a dot system so you always know the parts line up. Match the dots on the magwell and bolt, grab the barrel stamped with its caliber and twist, and you have a correct configuration every time. The barrel also carries a bore-evacuation chamber, which works alongside the UXR's modified long-stroke piston to smooth out the shot and keep recoil impulse down.
This kit is built specifically for the UXR platform and won't drop into a standard AR-15. If your UXR is already running a small-frame caliber like 5.56 or 300 BLK, the swap is quick since those share the same magwell footprint. Coming from a large-frame caliber like .308, you'll want to confirm you have the right magwell for the smaller cartridge family. Once it's set up, you get the reliability of the PWS long-stroke piston and the flexibility to run affordable, widely available .223 and 5.56 ammo.
No. This kit is engineered specifically for the PWS UXR serialized platform and its XChange system. It will not fit a conventional AR-15 or any other rifle. The conversion works by swapping the UXR's barrel, bolt head, and magwell, so you need the UXR receiver to run it.
A full UXR caliber change involves three parts: the barrel, bolt head, and magwell. This kit centers on the .223 Wylde barrel and matching bolt head. If you're already running a small-frame caliber like 5.56 or 300 BLK, your existing magwell handles the same cartridge family. Coming from a large-frame caliber, you'll want to confirm you have the correct small-frame magwell to complete the swap.
Yes. The .223 Wylde chamber is designed to run both. It uses a tighter throat than a standard 5.56 chamber for better accuracy with match .223 ammo, while still safely and reliably cycling 5.56 NATO. That flexibility is a big part of why Wylde is so popular for a do-it-all 16-inch build.
Each UXR component is marked with dots that indicate caliber compatibility, and barrels are stamped with their caliber and twist rate. To confirm a correct setup, you match the dots on the bolt and magwell and grab the labeled barrel. It's a simple visual check that helps keep every configuration lined up right.
| UPC | 811154032911 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | UXR-CK-223-16 |
| Barrel Length | 16'' |
| Caliber/Gauge | .223 Wylde |
| Color | Black |
| Length | 16'' |
| Model | |
| Product Type | Conv Kit |
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