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Cobalt Kinetics built its reputation on tightening up the AR platform where it matters most, and the CK-Pro URG in this 7.5" configuration is a good example of that philosophy in action. This is a Built upper receiver group, meaning the 5.56x45mm NATO barrel, bolt carrier group, and charging handle are already installed by Cobalt's own gunsmith staff and function tested before it ever leaves their shop. Drop it onto a mil-spec lower and you're ready to run it.
The billet 7075-T6 upper receiver pairs with a 6061 aluminum handguard that runs 6.75 inches and wraps the barrel in a 7-sided, semi-monolithic M-Lok rail. Cobalt attaches that handguard using a 4-point, 8-screw mounting system tied into a reverse-threaded barrel nut, a setup they engineered specifically to seat the barrel more evenly than a standard externally threaded receiver extension allows. The idea is simple: less flex at the barrel extension means the barrel can actually deliver the accuracy it's capable of instead of losing some of it to high spots in a typical mil-spec fit.
At 7.5 inches, this barrel length is aimed at builders who want a short, maneuverable upper for close-quarters use, whether that's a pistol build or a dedicated short-barrel project. The shorter barrel pairs with a pistol-length gas system, which keeps the whole package tight without sacrificing reliable cycling.
The Flat Dark Earth Cerakote finish gives it a durable, corrosion-resistant coat that also looks good sitting next to a matching lower or FDE furniture. Since this is the Built version rather than the stripped receiver, you're not left sourcing a BCG or charging handle separately, and Cobalt throws in one Duramag magazine to get you to the range without an extra stop.
Yes, this is the Built configuration, which means Cobalt Kinetics installs the bolt carrier group, charging handle, and barrel before it leaves their shop. Every Built URG is also test-fired for function, so it's ready to mount on a lower without any extra assembly.
This CK-Pro URG is built to work with standard mil-spec AR-15 lower receivers. Since it's chambered in 5.56x45mm NATO, pair it with a lower set up for that cartridge and you're good to go.
A pistol-length gas system is the natural fit for a barrel this short since it gives the gas enough dwell time to reliably cycle the action. It also keeps the overall gas block and handguard footprint compact, which fits the whole point of running a 7.5 inch setup.
Yes, Cobalt Kinetics includes one Duramag magazine with every Built CK-Pro URG. That's a nice bonus that saves you from needing to buy one separately just to test it out.
| UPC | 850060560576 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | CK-PRO-URG-556-75-B-FD |
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