Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig

If you are looking to build your own AR-15 from the ground up and want a platform that combines affordability with a straightforward milling process, the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is a solid choice. This 80% lower comes ready for you to finish at home, giving you the satisfaction of a custom build without the need for a full machine shop. Polymer80 has refined its design over several generations, and the Rhino V3 represents a mature, well-thought-out option for DIY builders who want a lightweight, durable polymer lower. Whether you are a first-time builder or a seasoned hobbyist, this kit includes the jig and bits you need to get started right out of the box.

Overview

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is a complete starter kit for building your own AR-15 lower receiver. It is made from a high-impact, glass-reinforced polymer that is both lighter than aluminum and resistant to corrosion. The 80% lower means the fire-control pocket and trigger pin holes are not fully machined, so you will need to complete them using the included jig and router or drill press. This model is compatible with standard AR-15 upper receivers and most mil-spec parts, making it a flexible foundation for a wide range of builds. The Rhino V3 improves on earlier versions with a reinforced rear takedown pin boss and a more ergonomic grip angle, giving you a more comfortable shooting experience once the build is complete.

Features & Specs

This kit is designed to simplify the build process while maintaining the quality you expect from a polymer lower. The jig is precision-molded to guide your tooling accurately, reducing the chance of errors. Below are the key features and specifications you can expect from the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig.

• Manufacturer: Polymer80; Category: Parts; Material: Glass-reinforced polymer for durability and weight savings
• Includes: one 80% lower receiver, one universal jig, drill bits, end mill, and instructions for a complete build kit
• Compatibility: Accepts standard AR-15 lower parts kits, buffer tubes, and pistol grips; works with most mil-spec uppers

The jig is reusable if you plan to build additional lowers, and the polymer construction means you will not have to worry about rust or heavy finishing work. The Rhino V3 also features an integrated trigger guard, which saves you from having to install a separate part later.

Who It’s For

This product is ideal for the DIY firearms enthusiast who wants to build a custom AR-15 without the expense of a fully machined lower. It is also a great option for someone who is new to building and wants a forgiving material to work with — polymer is easier to mill than aluminum, and the included jig takes much of the guesswork out of the process. Experienced builders will appreciate the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig for its lightweight profile and the ability to personalize the final product. Whether you are building a lightweight hunting rifle, a plinking setup, or a dedicated competition gun, this lower gives you a solid foundation that you can finish in a single afternoon with basic tools.

Shipping & FFL

Because this is an 80% lower receiver and is not yet a firearm, it can be shipped directly to your home address without the need for a Federal Firearms License (FFL) transfer. However, once you complete the machining and assemble the lower into a functional firearm, you must comply with all federal, state, and local laws regarding ownership and registration. It is your responsibility to check your local regulations before purchasing. The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig ships from our warehouse within one to three business days, and we only ship to addresses in states where 80% lowers are legal. No FFL transfer is required for this item, but we recommend verifying your local laws before placing an order.

• No FFL transfer needed for the 80% lower; ships directly to your door
• Check your state and local laws before purchasing; some jurisdictions restrict 80% receivers
• We ship via UPS or FedEx with adult signature required for delivery