The CMMG Upper Parts Kit (brand part no. 55AFF2F) bundles the pins and springs needed for routine AR-15 upper receiver maintenance and rebuilds into a single kit. Rather than tracking down each small part individually when you’re servicing an upper, this kit covers the common wear items in one order, sized to fit AR-15/M16/M4 platforms with a standard handguard. Shooters doing a periodic maintenance pass or building an upper from parts appreciate having the small hardware bundled together instead of hunting through a parts bin. It’s a practical, no-frills kit for keeping an AR-15 upper running reliably.

Key Specifications

• Pins-and-springs kit format bundles the common small parts needed for upper maintenance.
• Fits AR-15/M16/M4 standard handguard platforms matches this kit to that receiver family.
• Upper receiver application is built for maintenance and rebuild work rather than lower parts.
• 4.55 in length reflects the kit’s overall packaged sizing.

Frequently Asked Questions

What does this kit include? The pins and springs commonly needed for AR-15 upper receiver maintenance.

What platform does it fit? AR-15/M16/M4 platforms with a standard handguard.

Buy the CMMG AR-15 Upper Parts Kit, Pins & Springs

Keep your upper serviced with this CMMG kit from our small AR-15 parts selection. Order it from our Lubbock, Texas gun shop for fast, direct shipping right to your door.