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Cobalt Kinetics built the CK-Pro URG for folks who already know their way around an AR and want a higher-end platform to build on. This is the 6.75" rail version in the Cobalt Green (CKG) Cerakote finish, and it ships stripped, meaning you get the billet upper receiver and matched free-float handguard ready for you to add your own barrel, bolt carrier group, and charging handle. The 6.75" rail length is sized to run alongside a 7.5" barrel, so it's a natural fit for a compact, pistol-length build.
The heart of this system is Cobalt's proprietary reverse-threaded barrel nut. Instead of a standard externally threaded receiver extension, the reverse-threaded design seats the barrel evenly and provides more thread engagement, which lets the barrel extension surface be machined to a tighter tolerance. The practical upside is a barrel that gets to use more of its accuracy potential rather than fighting the high spots you sometimes find on mil-spec extensions.
The free-float handguard locks onto the extended portion of the upper through a four-point, eight-screw mounting system that threads right into the area housing the barrel nut. That gives you a genuinely non-rotating setup with monolithic-style rigidity, which shooters chasing a repeatable laser and optic zero tend to appreciate. The upper is machined from 7075 T6 billet aluminum with the handguard in 6061 aluminum, and the whole thing wears a durable Cerakote finish in that signature Cobalt Green.
Since this one comes stripped and multi-caliber, you've got the freedom to spec it out however your project calls for, whether that's a 5.56 or a .300 Blackout build. It's a clean foundation for a short, nimble AR, and the tolerances and finish are the kind of thing people notice the moment they pull it out of the box. Pair it with a quality barrel and BCG and you've got a platform that's built to run hard.
No, this is the stripped configuration, which is what the "S" in the part number indicates. It includes the billet upper receiver and the matched free-float handguard but no barrel, bolt carrier group, or charging handle. You'll need to supply those components to complete the build.
Cobalt Kinetics sizes the 6.75" rail to run with a 7.5" barrel, making it a good match for a compact, pistol-length AR build. Because it ships stripped and multi-caliber, you can set it up in 5.56 NATO or .300 Blackout depending on the barrel you choose.
The handguard attaches to the extended portion of the upper through a four-point, eight-screw mounting system that threads into the area housing the barrel nut. That creates a genuinely non-rotating, rigid setup similar to a monolithic upper. Builders chasing a repeatable optic and laser zero tend to value that stability.
CKG stands for Cobalt Green, Cobalt Kinetics' signature green Cerakote finish. Cerakote adds durability and corrosion resistance on top of the billet 7075 T6 aluminum upper. It's the same quality finish Cobalt uses across their completed platforms.
| UPC | 850060560309 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | CK-PRO-URG-675-S-CKG |
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