Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver With Jig

Build a custom AR15 platform on your terms with the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig. This complete kit provides the essential components for completing an 80% lower, giving you the control and craftsmanship required for a personalized firearm build. Designed for durability and ease of use, the RL556V3 is a direct choice for builders who demand reliability without compromise.

Overview

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is a precision-machined, unfinished lower receiver that requires final milling to become a functional firearm component. This kit includes the patented Rhino universal jig system, which simplifies the milling process and ensures accurate alignment for your build. Built from high-impact polymer, the RL556V3 maintains the structural integrity needed for a long-lasting AR15 lower while reducing overall weight. Whether you are a first-time builder or an experienced gunsmith, this kit delivers the foundation for a reliable, lawfully constructed firearm.

Features & Specs

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is engineered for precision and user convenience. Key features include:

• Manufacturer: Polymer80 – trusted name in 80% firearm components and DIY build kits
• Category: Parts – includes lower receiver, jig, drill bits, and installation hardware
• Material: Reinforced polymer composite for impact resistance and corrosion-free performance
• Compatibility: Accepts standard AR15 upper receivers, trigger groups, and buffer tube assemblies
• Jig System: Rhino universal jig with adjustable guide plates for accurate milling and drilling
• Finish: Textured grip surface and hard-anodized aluminum trigger guard
• Weight: Approximately 8.5 ounces – lightweight for maneuverability and carry
• Dimensions: Standard AR15 lower receiver geometry with reinforced front and rear takedown pin lugs

Additional specifications include a type III hard-coat anodized rear takedown pin detent and a threaded bolt catch pin for simplified assembly. The jig kit includes three drill bits and a center locator punch for precise operation.

• Complete 80% lower kit – no additional jig purchase required
• Includes 5-axis CNC-machined jig with hardened steel guide bushings
• Step-by-step instructions and online video support for first-time builders

Who It’s For

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is designed for individuals who want to legally manufacture their own firearm for personal use. It suits hobbyists, builders, and those who prefer a hands-on approach to firearm assembly. This kit is ideal for customers in states where 80% lowers are legal and who comply with all federal, state, and local laws regarding firearm manufacture. It is not intended for commercial resale or for use by prohibited persons. The included jig system makes this kit accessible to users with basic mechanical skills and access to a drill press or handheld drill.

Shipping & FFL

This Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is classified as an unfinished, non-firearm component under current federal regulations. It can be shipped directly to your residence or business without requiring a Federal Firearms License (FFL) transfer. However, you must verify that ownership and completion of 80% lowers are legal in your state and local jurisdiction. We ship via UPS Ground or FedEx Ground with adult signature required. No international shipping. By purchasing this item, you confirm that you are not a prohibited person under federal law and that you will complete the receiver only for personal use. All sales are final. Check your local laws before ordering.

• No FFL required for shipping this 80% lower kit to most US addresses
• Adult signature required upon delivery – must be 21 or older to receive
• You are responsible for compliance with all applicable laws regarding completion and ownership