Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig

If you are looking to take full control of your next AR-15 build, the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is a solid starting point. This kit brings together a durable, lightweight polymer lower and a complete jig system, so you can finish the receiver at your own pace with standard tools. Whether you are a first-time builder or a seasoned hobbyist, this setup gives you the freedom to create a custom firearm that is entirely your own.

Overview

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is designed for those who want to build a reliable AR-15 platform from an unfinished lower. This 80% receiver comes pre-molded in a rugged polymer composite, which means it is lighter than many aluminum options while still holding up to regular use. The included jig simplifies the finishing process by guiding your drill and router, helping you achieve consistent results. Because this is an 80% lower, it is not considered a firearm by the ATF until you complete the machining, so it ships directly to your door without an FFL transfer for the receiver itself.

Features & Specs

This kit is built around the RL556V3 lower, which features an integrated trigger guard and a reinforced buffer tower for added strength. The jig is made from hardened steel and includes drill bits and end mills to get the job done. Here is what you can expect from the kit:

• 80% finished polymer lower receiver compatible with standard AR-15 upper receivers and parts kits
• Includes the Rhino universal jig with pre-drilled guide holes, drill bits, and end mill
• Reinforced rear takedown pin boss and flared magazine well for easier reloads

Beyond the basics, the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig also offers a few design touches that make assembly smoother. The jig clamps securely to the receiver, and the included instructions walk you through each step. You will need a drill press or hand drill and a router to complete the fire control pocket and trigger pin holes. The finished lower accepts all standard AR-15 fire control groups and grips, so you can customize the trigger and ergonomics to your preference.

• Accepts mil-spec buffer tubes, stocks, and pistol braces
• Black textured finish for a non-slip grip
• Dimensions and pin placements match standard AR-15 lower specifications

Who It’s For

This kit is ideal for anyone who wants to build a firearm without the paperwork of a serialized receiver. It is a great choice for hobbyists who enjoy hands-on projects and want to learn how an AR-15 lower goes together. Because the jig does most of the alignment work, even someone with basic tool experience can finish this receiver successfully. The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is also popular among shooters who want a lightweight build for competition or range use. If you prefer a receiver that will not add unnecessary weight to your rifle, this polymer option fits the bill.

• DIY builders looking for a complete 80% lower and jig package
• Shooters who want a lighter alternative to aluminum receivers
• Anyone who wants to avoid a serialized receiver and the associated FFL transfer for the lower itself

Shipping & FFL

Because the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is an unfinished 80% receiver, it is not classified as a firearm by the ATF. This means it can be shipped directly to your home or business without an FFL transfer. No background check is required for the receiver itself. However, please check your local and state laws before ordering, as some jurisdictions have restrictions on 80% receivers. Once you complete the receiver, you must follow all applicable laws regarding serialization and transfer if you sell or give the firearm to another person. We recommend consulting with a local FFL or legal professional if you have any questions about compliance in your area.