Smith & Wesson M&P15 AR-15 Complete Upper Receiver Parts Kit – Precision Components for Reliable Performance

Building or rebuilding an AR-15 upper receiver? The Smith & Wesson M&P15 AR-15 Complete Upper Receiver Parts Kit gives you the small components and assemblies you need to finish a stripped upper. This kit bundles together the parts that are easy to lose, hard to source individually, and critical to reliable function—so you're not hunting for pins and springs across three different suppliers.

Whether you're assembling a new upper from scratch or replacing wear components on an existing receiver, this kit keeps the essentials in one place. The included forward assist assembly, ejection port cover, and all associated springs and pins let you complete the job without surprises. If you're experienced with AR platform assembly, you know that getting these small parts right makes the difference between a smooth build and a frustrating afternoon at the workbench.

M&P components are engineered to the same standards as factory Smith & Wesson rifles—reliable, proven, and built for real use. This kit works with standard AR-15 upper receivers and is designed for shooters and builders who want quality parts without the premium price tag of a fully finished upper.

Key Features

• Complete forward assist assembly—spring, roll pin, and housing included
• Ejection port cover assembly with hinge pin and clip
• Ejection port spring for smooth, reliable case ejection
• All small parts and hardware in one kit—no separate sourcing required
• Smith & Wesson M&P quality and engineering
• Compatible with standard AR-15 upper receivers

Specifications

Frequently Asked Questions

Will this kit work with my AR-15 upper receiver?

Yes, this kit is designed for standard AR-15 upper receivers. The components are cross-compatible with most AR platform builds.

What's included in this upper parts kit?

The kit includes a complete forward assist assembly (with spring and roll pin), an ejection port cover assembly (with hinge pin and clip), and an ejection port spring. These are the small components typically needed to finish a stripped upper receiver.

Is this kit suitable for a first-time AR builder?

Yes. Having these parts bundled together eliminates the challenge of sourcing individual small components. First-time builders benefit from having everything they need in one kit, though familiarity with AR assembly basics is recommended.

Do I need any other parts to complete my upper?

This kit supplies the small internal parts and assemblies for the upper receiver. Depending on your build, you may still need a barrel, bolt carrier group, charging handle, and rail system—this kit covers the receiver-specific hardware.