The Cobalt Kinetics CK-Pro Receiver Set is a matched AR-15 upper and lower receiver set finished in Flat Dark Earth Cerakote for builders who want a precision-machined foundation for a custom rifle (brand part no. CK-PRO-SET-118-FDE). Cobalt Kinetics machines the upper and lower from 7075 T6 aluminum and the handguard from 6061 aluminum, then secures the handguard to the upper with 8 TORX screws for a solid, non-rotating interface rather than a single clamp point. A reverse-threaded barrel nut seats the barrel evenly with more thread engagement than a traditional receiver extension, letting the barrel deliver its full accuracy potential. The set ships complete with the ejection port cover, forward assist, and all necessary mounting hardware, and it is built to accept barrels from 7.5 to 16 inches across multiple AR-15 calibers.

Key Specifications

• Caliber Compatibility: a multi-caliber AR-15 platform that accepts a barrel in the builder’s caliber of choice.
• Material: 7075 T6 aluminum upper and lower, 6061 aluminum handguard.
• Included Components: a matched upper, lower, handguard, ejection port cover, forward assist, and mounting hardware.
• Barrel Nut: a reverse-threaded design that seats the barrel evenly for maximum thread engagement and accuracy potential.
• Handguard Attachment: 8 TORX screws creating a non-rotating, solid handguard-to-upper interface.
• Finish: Flat Dark Earth Cerakote.
• Compatible Barrel Lengths: 7.5 to 16 inches.

Frequently Asked Questions

Does this include a barrel or bolt carrier group? No, this is a matched receiver set (upper, lower, and handguard); barrel and internals are sold separately.

Is it caliber-specific? No, it is a multi-caliber AR-15 receiver set built to accept a barrel in the builder’s caliber of choice.

What barrel lengths is it compatible with? The handguard and receiver system accommodate barrel lengths from 7.5 to 16 inches.

Buy the Cobalt Kinetics CK-Pro Receiver Set, FDE

The precision-machined barrel nut and non-rotating handguard interface make the CK-Pro a serious foundation for a custom AR-15 build. See more of Cobalt Kinetics’ AR-15 lowers and order yours from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.