The CMMG AR-15 Upper Pins and Springs Parts Kit (CMMG part no. 55AFF2F) bundles the small parts that tend to go missing from a mil-spec AR-15 upper. Whether you lost a spring on the range or want spares on the shelf, this kit has the pieces. It includes the front sight detent and spring, the extractor spring, buffer and pin, and the ejector, ejector spring and pin. CMMG states that all parts meet or exceed mil-spec. It keeps a standard upper running.

Key Specifications

• The kit is made for mil-spec AR-15 uppers, so the parts match the standard platform.
• It includes a front sight detent, which holds the front sight base in place.
• It includes a front sight spring, which keeps tension on the detent.
• It includes a forward assist spring, which returns the forward assist plunger.
• It includes an extractor spring, which keeps the extractor gripping the case rim.
• It includes an extractor buffer, which supports the extractor spring.
• It includes an extractor pin, which holds the extractor in the bolt.
• It includes an ejector, which throws the spent case clear.
• It includes an ejector and selector spring, which keeps the ejector under tension.
• It includes an ejector pin, which retains the ejector in the bolt, and every part is stated to meet or exceed mil-spec.

Frequently Asked Questions

What is in the upper pins and springs kit? The kit has a front sight detent, front sight spring, forward assist spring, extractor spring, extractor buffer, extractor pin, ejector, ejector and selector spring, and ejector pin.

Are the parts mil-spec? CMMG states that all parts in the kit meet or exceed mil-spec.

What is this kit used for? It replaces small upper-receiver parts on mil-spec AR-15 uppers that have been lost or worn, or serves as a set of spares.

Buy the CMMG AR-15 Upper Pins and Springs Parts Kit

The smallest parts on an upper are the ones that vanish at the range, and a missing spring can end a day early. This kit keeps replacements on hand for the standard AR-15 platform. Browse more small AR-15 parts, and order from our Lubbock, Texas gun shop for fast, direct shipping.