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This is the foundation for a serious build. The Cobalt Kinetics CK-Pro receiver set gives you a matched upper, lower, and 9.8-inch M-LOK handguard in a clean black finish, all designed to work together as one tight package. The upper and lower are machined from 7075-T6 aluminum, with the free-float handguard cut from 6061, so you're starting your project on real premium material instead of piecing together mismatched parts.
The heart of this set is Cobalt's proprietary reverse-threaded barrel nut. Instead of a standard externally threaded receiver extension, this design seats the barrel evenly and offers more thread engagement, which lets the barrel extension surface be machined to a tighter tolerance. In plain terms, that means the barrel sits truer and gets to use more of its accuracy potential without the high spots you'd find on a mil-spec setup. You get the rigidity and one-piece feel of a monolithic upper without the usual headaches that come with that style.
The 9.8" free-float handguard attaches to the extended portion of the upper using a four-point, eight-screw TORX system that bolts right to the section housing the barrel nut. The result is a genuine non-rotating interface, which is exactly what you want if you're running a light, laser, or NVG setup and need your zero to stay put through hard use. Builders who've run this system consistently point to the rigid rail and clean machining as the standout, along with an upper and lower that fit together like they were hand-matched.
Think of this as the skeleton of a top-tier AR. You'll still supply your barrel, bolt carrier group, trigger, and the rest, but the hardest parts to get right, the fit and the barrel-to-handguard junction, are already dialed in. It's a smart pick for a competition rig, a precision-minded build, or anyone who wants their next project to feel like a factory Cobalt without buying the complete rifle.
The set ships with the upper receiver, lower receiver, and 9.8" M-LOK handguard, plus the ejection port assembly, forward assist assembly, the necessary TORX screws, a jam nut, and the jam nut installation tool. It's the full receiver group foundation, so you'll add your own barrel, bolt carrier group, trigger, and furniture to finish the build.
The handguard bolts directly to an extended portion of the upper using a four-point, eight-screw TORX arrangement rather than clamping to a floating barrel nut. That gives you a truly locked, non-rotating interface that holds zero for mounted optics, lights, and lasers even under rough handling.
The receiver set itself is listed as multi-caliber, so it isn't tied to one chambering. The caliber is determined by the barrel and bolt carrier group you pair with it, which makes this a flexible starting point for a range of AR builds.
Instead of a standard externally threaded receiver extension, Cobalt uses a reverse-threaded barrel nut that seats the barrel evenly and adds thread engagement. This lets the barrel extension surface be machined to a tighter tolerance, which helps the barrel reach more of its accuracy potential and gives the upper that rigid, near-monolithic feel.
| UPC | 850060560804 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | CKPROSET98BLK |
| Caliber/Gauge | Multi |
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