Complete Your Build with Unmatched Reliability
Elevate your AR-15 assembly with the NDZ Performance Stainless Upper Parts Kit. Designed for the discerning builder who refuses to compromise, this comprehensive kit delivers all the essential small parts to complete your upper receiver with precision and durability. Featuring corrosion-resistant 303 stainless steel construction and a mirror-polished finish, this kit ensures smooth operation, easy maintenance, and a standout aesthetic. Perfect for first-time assemblers and seasoned armorers alike, it’s the definitive solution for a flawless, reliable build.
| Material | 303 Stainless Steel |
| Finish | Mirror Polished |
| Compatibility | Mil-Spec AR-15 Upper Receivers |
| Includes | Forward Assist Assembly, Ejection Port Cover Assembly, Ejection Port Door, Ejection Port Spring, Ejection Port Roll Pin, Ejection Port C-Clip, Takedown Pin Detent, Pivot Pin Detent |
| Kit Type | Complete Upper Parts Kit (No Barrel or Bolt Carrier Group) |
| SKU | NDZ-UPK-SS |
Is this a complete kit for building an upper receiver?
Yes, the NDZ Performance Stainless Upper Parts Kit includes all the necessary small internal components to complete a stripped or bare upper receiver. This includes the forward assist assembly and the entire ejection port cover (dust cover) assembly with all springs, pins, and the door itself. Please note, this kit does not include larger components like the barrel, handguard, bolt carrier group, or charging handle, which must be sourced separately.
Why choose 303 stainless steel for these parts?
303 stainless steel is chosen for its excellent machinability and well-rounded corrosion resistance. Unlike standard carbon steel parts that can rust, the stainless construction provides long-term durability and reliability, especially in humid or harsh environments. The mirror polish not only adds a sharp, custom look to your build but also creates a smoother surface that reduces friction and makes cleaning carbon buildup significantly easier.
Will these parts fit my specific upper receiver?
This kit is manufactured to standard Mil-Spec dimensions, ensuring compatibility with the vast majority of AR-15 platform upper receivers on the market. It is designed to fit any forge-marked or billet upper that adheres to these common specifications. We always recommend verifying your receiver’s specifications, but you can proceed with confidence knowing NDZ Performance parts are renowned for their precise fit and adherence to industry standards.
Is installation difficult for a beginner?
Installing an upper parts kit is a straightforward process with the right tools. The most challenging aspects are typically installing the ejection port cover roll pin and the forward assist roll pin, which require a roll pin punch set and a small hammer. We highly recommend consulting a detailed assembly guide or video tutorial. With patience and proper tools, even a first-time builder can achieve a professional-quality installation.
Reviewed by our certified gunsmith team. 15+ years experience.
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