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Cobalt Kinetics CK-SPR Built Upper Receiver Group

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Questions & Answers

Product Discontinued by Manufacturer

Cobalt Kinetics CK-SPR Built Upper Receiver Group has been discontinued by Cobalt Kinetics and is no longer available. Our product experts have helped us select these available replacements below.You can also explore other items in the Gun Parts, AR 15 Parts, Rifle Parts, AR15 Upper Receivers yourself to try and find the perfect replacement for you!

ATTENTION! We currently do not ship this product to P.O. Boxes, AK, CA, CT, DE, HI, MA, NJ, NY, U.S. Territories, or select Colorado locations. Please see our policies for more information or a detailed list of locations.

Product Info for Cobalt Kinetics CK-SPR Built Upper Receiver Group

The Cobalt Kinetics CK-SPR Upper Receiver Groups were designed for end users that want to upgrade their current AR’s to have the same performance edge featured in our completed platforms. All CK-Pro URG’s are expertly built by our gunsmith staff and come with 1 Duramag. Built URG’s are test-fired for function before leaving out the door to the customer. Upgrade your current platform, RUN COBALT!image

Features of Cobalt Kinetics CK-Pro Built Upper Receiver Group:

  • Cutting edge innovation.
  • Military grade durability.
  • Match grade precision.
  • Uncompromising functionality.

Package Contents:

  • Cobalt Kinetics CK-SPR Built Upper Receiver Group

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Cobalt Kinetics CK-SPR Built Upper Receiver Group Unavailable & Discontinued Models

List of Unorderable Models

  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 16in Barrel, .223 Wylde, Stainless Steel, CK-SPR-URG-223W-16-B-SS , MPN: CK-SPR-URG-223W-16-B-SS , UPC: 660457547543 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-223W-16-B-SS
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 16in Barrel, .223 Wylde, Charcoal, CK-SPR-URG-223W-16-B-CH , MPN: CK-SPR-URG-223W-16-B-CH , UPC: 660457805056 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-223W-16-B-CH
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 16in Barrel, .223 Wylde, FDE, CK-SPR-URG-223W-16-B-FDE , MPN: CK-SPR-URG-223W-16-B-FDE , UPC: 660457887243 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-223W-16-B-FDE
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 16in Barrel, .223 Wylde, Black, CK-SPR-URG-223W-16-B-BLK , MPN: CK-SPR-URG-223W-16-B-BLK , UPC: 660457778213 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-223W-16-B-BLK
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 16in Barrel, .223 Wylde, OD Green, CK-SPR-URG-223W-16-B-CKG , MPN: CK-SPR-URG-223W-16-B-CKG , UPC: 660457542074 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-223W-16-B-CKG
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 14,5in Barrel, 6mm ARC, OD Green, CK-SPR-URG-6ARC-145-CKG , MPN: CK-SPR-URG-6ARC-145-CKG , UPC: 660457555463 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-6ARC-145-CKG
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 14,5in Barrel, 6mm ARC, Charcoal, CK-SPR-URG-6ARC-145-CH , MPN: CK-SPR-URG-6ARC-145-CH , UPC: 660457978132 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-6ARC-145-CH
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 16in Barrel, 6.5mm Grendel II, Charcoal, CK-SPR-URG-65G-16-B-CH , MPN: CK-SPR-URG-65G-16-B-CH , UPC: 660457933094 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-65G-16-B-CH
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 16in Barrel, 6.5mm Grendel II, Black, CK-SPR-URG-65G-16-B-BLK , MPN: CK-SPR-URG-65G-16-B-BLK , UPC: 660457867924 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-65G-16-B-BLK
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 14,5in Barrel, 6mm ARC, Stainless Steel, CK-SPR-URG-6ARC-145-SS , MPN: CK-SPR-URG-6ARC-145-SS , UPC: 660457645270 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-6ARC-145-SS
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 18in Barrel, 6mm ARC, Stainless Steel, CK-SPR-URG-6ARC-18-SS , MPN: CK-SPR-URG-6ARC-18-SS , UPC: 660457729635 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-6ARC-18-SS
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 18in Barrel, 6.5mm Grendel II, Charcoal, CK-SPR-URG-65G-18-B-CH , MPN: CK-SPR-URG-65G-18-B-CH , UPC: 660457525305 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-65G-18-B-CH
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 18in Barrel, 6.5mm Grendel II, FDE, CK-SPR-URG-65G-18-B-FDE , MPN: CK-SPR-URG-65G-18-B-FDE , UPC: 660457770095 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-65G-18-B-FDE
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 16in Barrel, 6.5mm Grendel II, FDE, CK-SPR-URG-65G-16-B-FDE , MPN: CK-SPR-URG-65G-16-B-FDE , UPC: 660457954150 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-65G-16-B-FDE
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 18in Barrel, 6.5mm Grendel II, Stainless Steel, CK-SPR-URG-65G-18-B-SS , MPN: CK-SPR-URG-65G-18-B-SS , UPC: 660457546010 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-65G-18-B-SS
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 18in Barrel, .223 Wylde, FDE, CK-SPR-URG-223W-18-B-FDE , MPN: CK-SPR-URG-223W-18-B-FDE , UPC: 660457701457 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-223W-18-B-FDE
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 18in Barrel, .223 Wylde, Charcoal, CK-SPR-URG-223W-18-B-CH , MPN: CK-SPR-URG-223W-18-B-CH , UPC: 660457947015 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-223W-18-B-CH
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 18in Barrel, .223 Wylde, OD Green, CK-SPR-URG-223W-18-B-CKG , MPN: CK-SPR-URG-223W-18-B-CKG , UPC: 660457859660 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-223W-18-B-CKG
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 18in Barrel, 6mm ARC, OD Green, CK-SPR-URG-6ARC-18-CKG , MPN: CK-SPR-URG-6ARC-18-CKG , UPC: 660457766685 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-6ARC-18-CKG
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 18in Barrel, 6mm ARC, Black, CK-SPR-URG-6ARC-18-BLK , MPN: CK-SPR-URG-6ARC-18-BLK , UPC: 660457719070 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-6ARC-18-BLK
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 14,5in Barrel, 6mm ARC, FDE, CK-SPR-URG-6ARC-145-FDE , MPN: CK-SPR-URG-6ARC-145-FDE , UPC: 660457746861 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-6ARC-145-FDE
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 18in Barrel, 6.5mm Grendel II, Black, CK-SPR-URG-65G-18-B-BLK , MPN: CK-SPR-URG-65G-18-B-BLK , UPC: 660457784405 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-65G-18-B-BLK
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 16in Barrel, 6.5mm Grendel II, OD Green, CK-SPR-URG-65G-16-B-CKG , MPN: CK-SPR-URG-65G-16-B-CKG , UPC: 660457831529 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-65G-16-B-CKG
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 18in Barrel, .223 Wylde, Black, CK-SPR-URG-223W-18-B-BLK , MPN: CK-SPR-URG-223W-18-B-BLK , UPC: 660457573900 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-223W-18-B-BLK
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 14,5in Barrel, 6mm ARC, Black, CK-SPR-URG-6ARC-145-BLK , MPN: CK-SPR-URG-6ARC-145-BLK , UPC: 660457906838 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-6ARC-145-BLK
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 18in Barrel, 6.5mm Grendel II, OD Green, CK-SPR-URG-65G-18-B-CKG , MPN: CK-SPR-URG-65G-18-B-CKG , UPC: 660457856058 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-65G-18-B-CKG
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 16in Barrel, 6.5mm Grendel II, Stainless Steel, CK-SPR-URG-65G-16-B-SS , MPN: CK-SPR-URG-65G-16-B-SS , UPC: 660457654043 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-65G-16-B-SS
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 18in Barrel, .223 Wylde, Stainless Steel, CK-SPR-URG-223W-18-B-SS , MPN: CK-SPR-URG-223W-18-B-SS , UPC: 660457581561 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-223W-18-B-SS
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 18in Barrel, 6mm ARC, FDE, CK-SPR-URG-6ARC-18-FDE , MPN: CK-SPR-URG-6ARC-18-FDE , UPC: 660457635004 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-6ARC-18-FDE
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 18in Barrel, 6mm ARC, Charcoal, CK-SPR-URG-6ARC-18-CH , MPN: CK-SPR-URG-6ARC-18-CH , UPC: 660457667678 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-6ARC-18-CH
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 22in Barrel, 6mm ARC, Stainless Steel, CK-SPR-URG-6ARC-22-SS , MPN: CK-SPR-URG-6ARC-22-SS , UPC: 660457921244 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-6ARC-22-SS
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 22in Barrel, 6mm ARC, OD Green, CK-SPR-URG-6ARC-22-CKG , MPN: CK-SPR-URG-6ARC-22-CKG , UPC: 660457871211 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-6ARC-22-CKG
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 22in Barrel, 6mm ARC, Black, CK-SPR-URG-6ARC-22-BLK , MPN: CK-SPR-URG-6ARC-22-BLK , UPC: 660457735995 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-6ARC-22-BLK
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 22in Barrel, 6mm ARC, Charcoal, CK-SPR-URG-6ARC-22-CH , MPN: CK-SPR-URG-6ARC-22-CH , UPC: 660457592222 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-6ARC-22-CH
  • Cobalt Kinetics CK-SPR Built Upper Receiver Group, 22in Barrel, 6mm ARC, FDE, CK-SPR-URG-6ARC-22-FDE , MPN: CK-SPR-URG-6ARC-22-FDE , UPC: 660457740777 , Code: 4U3-URC-URG6ZZ-CK-SPR-URG-6ARC-22-FDE
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Last updated 2026-10-14 UTC.