Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver With Jig

Build your own custom AR-15 platform from the ground up with the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig. This complete kit provides the foundation for a legally compliant, personally manufactured firearm without the need for a serial number or FFL transfer for the raw receiver. Designed for serious DIY builders, the RL556V3 combines Polymer80’s proven polymer construction with an integrated jig system to simplify the milling process.

Overview

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is a pre-machined, unfinished lower receiver that requires final material removal to become functional. This package includes the Rhino jig, drill bits, and end mill, giving you everything needed to complete the receiver at home. The 80% design means you take the final steps to finish the fire control pocket and trigger pin holes, resulting in a firearm that is not serialized and does not require a background check for the receiver itself. The RL556V3 is compatible with standard AR15 upper receivers, parts kits, and magazines, making it a versatile starting point for your build.

Features & Specs

• Complete Kit: Includes the Polymer80 RL556V3 80% lower receiver, Rhino jig, drill bits, end mill, and all necessary hardware for finishing the receiver.
• Polymer Construction: Impact-resistant, glass-reinforced polymer provides durability while reducing overall weight compared to aluminum receivers.
• Mil-Spec Compatibility: Accepts standard AR15 lower parts kits, buffer tubes, and pistol grips; works with mil-spec and many commercial-spec upper receivers.

The RL556V3 features an integrated trigger guard, a flared magazine well for faster reloads, and a reinforced rear takedown pin boss. The included Rhino jig is reusable and precisely aligns with the receiver’s pre-drilled pilot holes to guide your drill and end mill accurately.

• Jig System: The Rhino jig includes hardened steel guide bushings and a clamping mechanism to hold the receiver securely during milling.
• Legal Compliance: As an 80% receiver, the RL556V3 ships directly to your doorstep without FFL transfer. You are responsible for ensuring your build complies with all local, state, and federal laws.

Who It’s For

This kit is intended for experienced firearm builders and hobbyists who own the necessary tools (drill press or hand drill) to complete the receiver. The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is ideal for those who want a custom, legally built firearm without the paperwork of a serialized receiver. If you have moderate mechanical skills and can follow detailed instructions, this kit offers a straightforward path to a personalized AR15 lower. It is not recommended for first-time builders without prior experience using jigs or power tools on firearm components.

Shipping & FFL

This Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig ships directly to your residence or business address. Because it is an unfinished 80% lower receiver, it is not considered a firearm by the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) and does not require transfer through a Federal Firearms License (FFL) dealer. However, once you complete the receiver, you must comply with all applicable federal, state, and local laws regarding the manufacture and possession of a firearm. Some states and localities prohibit or restrict the possession or completion of 80% receivers. It is your responsibility to verify legality in your jurisdiction before purchasing. By ordering this product, you confirm that you are legally eligible to possess a firearm and that you will not transfer the completed receiver to any person prohibited from owning firearms.