CMMG AR-15 Upper Parts Kit – Pins & Springs

The CMMG AR-15 Upper Parts Kit provides essential small components for completing or repairing an AR-15 upper receiver. This kit includes the forward assist assembly (spring and pin), ejection port cover assembly (spring, C-clip, and pin), and associated hardware—critical parts that are easily lost during builds or wear out over time. Whether you're assembling a new upper from scratch or replacing damaged components, this kit ensures you have the correct factory-spec parts on hand.

All components are machined to mil-spec dimensions and feature durable phosphate or black oxide finishes where applicable. Installation is straightforward for builders familiar with AR-15 assembly, though care must be taken with small springs and pins. A roll pin punch set and armorer's block are recommended to avoid marring the receiver or losing parts during installation.

• Part Type: Upper receiver small parts kit (forward assist & ejection port cover assemblies)
• Compatible Firearms: AR-15 / M16 / M4 upper receivers
• Material: Steel components
• Finish: Phosphate / Black oxide
• Installation: Drop-in for experienced builders; professional installation recommended for first-time assemblers
• Includes: Forward assist spring, forward assist pin, ejection port cover spring, ejection port cover C-clip, ejection port cover pin