Mk3 Parts Kit - Bolt Rehab

The Mk3 Parts Kit – Bolt Rehab from CMMG is a precision maintenance component designed for operators who demand reliable bolt function in demanding environments. This kit is essential for maintaining the performance of modern sporting rifles during competition, tactical operations, or training scenarios. It addresses wear, carbon buildup, and spring fatigue that accumulate during extended firing cycles.

The Mk3 bolt rehabilitation system restores critical tolerances and extends the service life of your upper receiver assembly. The kit contains precision-engineered replacement components that target the most wear-prone areas of the bolt carrier group. Proper installation restores bolt-to-carrier lockup, improves gas port sealing, and reduces carrier tilt, which are all factors that directly influence accuracy and reliability.

This kit is particularly beneficial for operators running high-round-count training regimens, 3-gun competitors, and duty rifle maintainers who cannot afford feeding or extraction failures. With a compact package size of 4 x 0.9 x 6.2 inches and a weight of just 0.08 lbs, integration into your existing platform is straightforward and requires no system redesign. Installation requires basic armorer knowledge, making it accessible for most users.