Description

Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver With Jig

Overview

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is a purpose-built platform for builders who demand precision and control over their firearm assembly process. This 80% lower receiver allows you to complete the machining steps required to finish the lower, giving you a fully functional AR15 receiver that is not serialized when sold. The included jig system provides repeatable alignment and guidance for the necessary milling and drilling operations. As a direct purchase from our US firearms retail inventory, this unit ships without a serial number and is not considered a firearm under federal law until you complete the machining process. The RL556V3 is engineered by Polymer80, a manufacturer recognized for reliable polymer lower components in the custom build market.

Features & Specs

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig combines durable polymer construction with a complete jig set to simplify your build. The lower receiver is molded from impact-resistant polymer to withstand standard AR15 operating stresses while maintaining a lightweight profile. The jig includes all necessary drill bushings, end mill guides, and clamping components required for accurate pocketing and pin hole drilling. This kit is designed for use with standard AR15 upper receiver assemblies and mil-spec trigger groups.

• 80% unfinished lower receiver made from reinforced polymer; requires final machining to complete
• Complete jig system with hardened steel bushings and alignment guides for the RL556V3 pocket geometry
• Compatible with mil-spec AR15 upper receivers, buffer tubes, and trigger components

• Manufacturer: Polymer80; category: Parts; model: RL556V3 Rhino
• No serial number, no federal firearm transfer required at point of sale
• Jig is reusable and includes instructions for proper machining sequence

• Lower receiver weight: approximately 7.5 ounces; overall length: standard AR15 dimensions
• Finish: black textured polymer; resistant to solvents and impact
• Includes drill bits, end mill, and allen wrenches for basic tooling

Who It’s For

This Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is intended for experienced builders who own or have access to a drill press, router, or milling machine and understand the dimensional requirements of an AR15 lower. It is not for first-time gun owners or individuals unfamiliar with metal or polymer machining. Builders who want to legally manufacture their own firearm for personal use, without serialization or background checks at the time of purchase, will find this kit appropriate. We recommend reviewing all applicable federal, state, and local laws before purchasing this 80% lower. Commercial gunsmiths and hobbyists who value the satisfaction of completing a lower from an 80% stage will benefit from the included jig system and Polymer80’s established design.

Shipping & FFL

This Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is not a firearm under federal law and does not require shipment to a Federal Firearms License (FFL) dealer. It will ship directly to your provided address within the United States. However, you are solely responsible for verifying that the purchase, possession, and completion of an 80% lower receiver is legal in your state, county, and municipality. Some jurisdictions, including but not limited to California, New York, New Jersey, Connecticut, Washington D.C., and certain cities, have restrictions on 80% lowers, unserialized receivers, or self-manufactured firearms. We will not ship to locations where these items are prohibited. No returns or exchanges are accepted on 80% receivers or jig kits. By completing your purchase, you confirm you are legally allowed to own this item and that you will comply with all applicable laws regarding the machining and possession of the finished lower receiver.