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Cobalt Kinetics built the CK-Pro receiver set for folks who want to start their next AR project with a foundation that punches way above the average parts kit. This is the same platform the company uses on its complete rifles, and it's built around a proprietary upper receiver extension that gives your barrel a truly solid seat while locking the handguard down tight. The result is a rigid, repeatable setup that feels more like a machined-from-one-piece upper than a bolted-together assembly, and this version wears a sharp CK Green Cerakote finish that sets it apart on the rack.
The heart of this thing is the non-rotating handguard interface. Instead of a standard barrel nut and clamp, the 6.75-inch M-LOK handguard secures to the extended portion of the upper with eight TORX head screws. That means no handguard flex, no rotation, and a stable foundation that holds a zero on your optic or laser through hard use. Both the upper and lower are cut from 7075-T6 billet aluminum, and the integrated trigger guard on the lower is a nice touch that removes one more small part from the equation.
Because the receiver extension is proprietary and reverse threaded, the barrel extension seats evenly with more thread engagement than a typical mil-spec setup. Builders who have run these sets consistently point to the immaculate machining and finish, and note how well the upper and lower fit together right out of the box. If you're chasing accuracy and a build that feels dialed-in from the ground up, this is a serious starting point.
Keep in mind this is a receiver set, not a complete upper. You'll be supplying your own barrel, bolt carrier group, gas system, trigger, and lower parts to finish the build, which is exactly what makes it appealing to anyone who wants full control over the final configuration.
This is a receiver set, not a complete or assembled upper. It ships with the upper, lower, handguard, ejection port and forward assist assemblies, plus the screws, jam nut, and installation tool. You'll still need to add a barrel, bolt carrier group, gas system, trigger, and the remaining lower parts to finish your build.
Cobalt Kinetics uses a proprietary receiver extension that the handguard bolts to with eight TORX head screws rather than clamping to a standard barrel nut. That direct, multi-point attachment eliminates handguard rotation and flex. The payoff is a stable platform that helps hold your optic or laser zero through hard use.
The receiver set itself is multi-caliber since it doesn't include a barrel. The chambering is determined by whichever barrel and bolt you choose during your build. That flexibility is part of why builders like starting with a receiver set rather than a fixed configuration.
The 6.75 refers to the length of the M-LOK handguard included in this set. Cobalt offers the CK-Pro receiver set in several handguard lengths to match different barrel and build plans. Pick the length that fits the barrel and gas system you intend to run.
| UPC | 850060560781 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | CK-PRO-SET-675-CKG |
| Caliber/Gauge | Multi |
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