Lantac USA LLC USR, Upper Standard Reciever, 556NATO, AR-15, 01-RV-UP-USR-SF15 M4 Feed Ramps, Black Finish

The Lantac USA LLC USR AR-15 upper standard receiver is built for shooters and builders who demand precision and reliability without compromise. This 5.56 NATO upper receiver comes finished in black and is engineered to handle the demands of range work, competition, and field use. Whether you're completing a new build or upgrading an existing platform, a quality upper receiver is the foundation of a dependable AR-15—and Lantac's reputation for tight tolerances and consistent performance makes this a solid choice for builders who understand that fit and finish matter.

The USR upper features M4 feed ramps, a standard specification that ensures reliable chambering and feeding across a wide variety of 5.56 NATO ammunition. This compatibility with M4-spec components means you're working within the most common and proven platform in the AR market, making parts sourcing and customization straightforward. The upper is manufactured to tight specifications, which translates to minimal receiver-to-receiver variation—something that becomes apparent during assembly and becomes important when you're pairing it with a lower receiver and bolt carrier group.

Lantac has built its reputation on precision manufacturing and long-term reliability. This upper receiver reflects that focus: clean machining, consistent dimensions, and a black finish applied to protect the aluminum from corrosion and wear. It's the kind of component that doesn't need to be flashy—it just needs to work reliably for years of shooting.

Key Features

• Chambered in 5.56 NATO
• M4 feed ramps for reliable ammunition feeding
• Precision-manufactured to tight tolerances
• Durable black finish
• Standard upper receiver compatible with most AR-15 lower receivers and components

Specifications

Frequently Asked Questions

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

Yes. This is a standard AR-15 upper receiver and will mate with any standard AR-15 lower receiver. The upper and lower are held together by two pins and do not require a permanent bond, so you can swap uppers between compatible lowers as needed.

What ammunition does this upper chamber?

This upper is chambered in 5.56 NATO and will safely fire 5.56 NATO ammunition. The M4 feed ramps support reliable feeding of 5.56 NATO rounds across various bullet profiles and manufacturers.

Is this a complete upper or a receiver only?

This is an upper receiver component only. You will need to source a bolt carrier group, charging handle, barrel, and other components separately to complete a functional upper assembly, or pair it with a complete upper if you prefer a turn-key solution.