The CMMG AR-15 Essential Field Repair Parts Kit is a bundle of the most likely small-parts replacements from CMMG (brand part no. 55AFF16) designed to get a down AR-15 back up and running at a critical moment. The 1 lb kit covers the firing pin, firing pin retaining pin, hammer and trigger springs, hammer/trigger pins, extractor with spring and buffer, extractor pin, twin ejectors with springs, disconnect spring, and ejector roll pin — essentially the small components most prone to failure or loss during a strip-down. Keeping this kit in a range bag or armorer’s box means a broken spring or lost pin doesn’t end a range day or a hunt.

Key Specifications

• Includes firing pin, firing pin retaining pin, and hammer/trigger springs.
• Includes extractor with spring/buffer and extractor pin.
• Includes two ejectors, ejector springs, and ejector roll pin.
• Includes hammer/trigger pins and disconnect spring.
• Weight is 1.00 lb.

Frequently Asked Questions

Does this kit include everything needed for a full AR-15 rebuild?
No, it covers the most likely small parts to fail or get lost — firing pin, springs, extractor, and ejector components — rather than a full parts list.

Is this kit compatible with other AR-15 builds, or only CMMG rifles?
These are standard mil-spec AR-15 small parts, so the kit is generally compatible across AR-15 platforms, not just CMMG rifles.

CMMG builds this repair kit, part of our AR lower parts kits selection.

Buy the CMMG AR-15 Essential Field Repair Parts Kit

Don’t get caught with a down rifle — keep the CMMG Field Repair Kit on hand, ships fast from a Lubbock, TX gun shop.