Cobalt

CK Pro Series

The CK Pro Series redesigns the upper receiver group around a reverse-threaded barrel nut that seats the barrel evenly with more thread engagement than traditional externally-threaded receiver extensions, letting the barrel use its full accuracy potential. The free-floated handguard mounts to the extended upper through a 4-point, 8-screw system for a complete upper receiver assembly — the benefits of a monolithic upper without its drawbacks. Available in standard and ambidextrous (AMBI) controls, 7.5"–16" barrels, in 5.56x45mm and .300BLK.

• Reverse-threaded barrel nut for tighter tolerances than Mil-Spec receiver extensions
• 4-point, 8-screw free-floated handguard mount
• CK-Pro Lite — 7.5", 11.5", 14.5" and 16" barrels, standard or ambidextrous
• Cobalt lifetime warranty