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The Primary Weapons Systems UXR Elite Conversion Kit is how you unlock the whole point of owning a UXR. Rather than buying a second rifle to shoot a different cartridge, you swap three parts on the same serialized upper and go. This kit is built around .300 AAC Blackout, a round that was purpose-designed for short barrels and suppressed shooting, with a 14.5" barrel that keeps things compact while still giving your loads room to work. If you already run a UXR in .223 Wylde or another chambering, this is the fast lane to a dedicated Blackout setup.
The UXR's XChange design lets you change chamberings by exchanging just the barrel, bolt head, and magazine well. Every UXR barrel is marked with its caliber and twist rate, and the magwell and bolt carry matching alignment dots, so the whole conversion stays error free and repeatable. Because the upper is the serialized part, you keep the same host and simply reconfigure it around the parts in this kit. The modified long-stroke piston system was engineered so you do not have to readjust the gas system every time you change barrels or calibers, which is a big deal when you bounce between rounds.
.300 Blackout earns its keep with versatility. It runs supersonic loads in the 110 to 125 grain range for full-power work, then switches to heavy 220 grain subsonic loads that stay below the sound barrier for the quietest suppressed shooting. The UXR's bore evacuator sits ahead of the gas block and helps push gas toward the muzzle, cutting back pressure that would otherwise blow back in your face when a can is threaded on. Between that gas management and a caliber built for short barrels, this kit turns the UXR into a genuinely capable suppressed platform.
This is the Elite-tier kit, machined and finished in black to match the rest of the UXR family. PWS backs its uppers and rifles with a sub-MOA accuracy guarantee when you feed them quality ammo, and this barrel assembly carries that same reputation for consistent cycling across a wide spread of subsonic and supersonic loads.
It converts a PWS UXR Elite over to .300 AAC Blackout by swapping the barrel, bolt head, and magazine well. You keep the same serialized upper receiver, so you are reconfiguring the rifle you already own rather than buying a second gun. The whole change centers on the three XChange components in this kit.
No. The UXR runs a modified long-stroke piston system designed to cycle reliably across calibers and barrel lengths without retuning every time you swap. That said, the UXR does have an adjustable gas block if you want to fine-tune for a particular suppressed or subsonic setup.
.300 Blackout was built for short barrels and suppressed use, and it shines with heavy subsonic loads that stay below the sound barrier. The UXR's bore evacuator ahead of the gas block reduces back pressure, which makes the suppressed experience noticeably cleaner. Pair it with a .30-caliber can and quality subsonic ammo for the quietest results.
It is designed for the PWS UXR Elite platform, which uses the XChange system. Each barrel is marked with its caliber and twist rate, and the magwell and bolt carry matching alignment dots to keep the conversion straightforward. If you own a UXR Elite, this kit drops right into that ecosystem.
| UPC | 811154032935 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | UXR-CK-300BLK-14 |
| Barrel Length | 14.5'' |
| Length | 14.5'' |
| Model | |
| Caliber/Gauge | .300 AAC Blackout |
| Product Type | Kit |
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