The CMMG Bolt Rehab Kit for the AR-15 (CMMG part no. 55AFF68) restores a tired bolt with fresh wear parts. CMMG lists it as a mil-spec kit for AR-15 rifles in 5.56mm, .223 and .300 Blackout. It includes the extractor group, the ejector group, the firing pin, the cam pin and three gas rings, which are the parts that wear first inside a bolt. Rebuild the bolt you already own instead of buying a new carrier group.

Key Specifications

• The kit is made for the AR-15 platform, and CMMG lists it for 5.56mm, .223 and .300 Blackout.
• The extractor group includes the extractor, extractor spring with buffer, extractor pin and spring O-ring.
• The ejector group includes the ejector, ejector spring and ejector roll pin.
• The firing pin and firing pin retaining pin are included for ignition reliability.
• It includes a cam pin, which controls the bolt’s rotation in the carrier.
• Three gas rings are included, the parts that seal the bolt as they wear.
• All parts meet or exceed mil-spec.

Frequently Asked Questions

Which calibers is this bolt rehab kit for? CMMG lists it as a mil-spec bolt rehab kit for the AR-15 in 5.56mm, .223 and .300 Blackout.

What parts does the kit replace? It replaces the ejector, ejector spring, ejector roll pin, extractor, extractor spring with buffer, extractor pin, extractor spring O-ring, firing pin, firing pin retaining pin, cam pin and three gas rings.

Buy the CMMG Bolt Rehab Kit for AR-15

A bolt that has seen thousands of rounds usually needs springs, rings and pins rather than replacement. This kit renews the wear parts together. Browse more small AR-15 parts and order from our Lubbock, Texas gun shop for fast, direct shipping.