Cmmg 308Ar Mk3 Bolt Rehab Kit

A CMMG 308 AR Mk3 Bolt Rehab Kit gives you everything needed to overhaul or repair a worn 308 AR bolt without the cost of a full replacement. If your .308 upper is seeing heavy use at the range or in the field, bolt components wear down over time—and a complete refresh keeps your rifle running like new. This kit assembles all the individual parts in one package, making it straightforward to do the work yourself if you have basic gunsmithing tools and knowledge.

The kit works with CMMG and DPMS pattern bolts, covering the most common .308 AR platforms out there. Whether you're maintaining a competition rifle, working through a high-round-count build, or bringing an older upper back to life, having quality OEM components on hand means you're not waiting for a mail-in repair. The Mk3 design is proven across CMMG's .308 rifle line, so you know the parts are engineered to fit and function together.

Bolt rebuilds aren't complicated if you take your time and follow a good reference (your rifle's manual or a detailed how-to video). This kit eliminates guesswork by bundling every wear item in one place, so nothing gets overlooked. Keep one on the shelf for your next scheduled maintenance cycle, or grab it when you notice extraction problems, weak ejection, or a firing pin that's seen better days.

Key Features

• Complete bolt overhaul kit for .308 AR rifles
• Compatible with CMMG, DPMS, and similar Mk3 bolts
• Includes firing pin, extractor, gas ring, ejector, and all retaining pins and springs
• OEM CMMG parts engineered for reliable function
• Eliminates need for full bolt replacement on worn components

Specifications

Frequently Asked Questions

Will this kit fit my DPMS .308 AR upper?

Yes. The Mk3 Bolt Rehab Kit is compatible with DPMS and similar pattern bolts, in addition to CMMG rifles. Verify that your bolt uses the Mk3 design before ordering if you're unsure.

What's actually included in the kit?

The kit contains a complete set of bolt wear items: firing pin, firing pin retaining pin, extractor assembly (pin, springs, and extractor), helical gas ring, ejector assembly (ejector, spring, and roll pin), and cam pin. Everything needed for a full rehab in one box.

Do I need gunsmithing experience to rebuild my bolt?

Basic familiarity with bolt disassembly and reassembly is helpful. We recommend consulting your rifle's manual or a detailed instructional video before starting. If you're not comfortable doing the work yourself, a gunsmith can handle the installation quickly.

When should I rebuild my bolt instead of replacing it?

A rehab kit is ideal if your bolt is function-sound but showing wear in specific components—weak ejection, extraction problems, or a worn firing pin. If the bolt carrier itself is cracked or damaged, full replacement is the better choice.