Description

Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver Only

For builders who demand a solid foundation without the paperwork, the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver Only delivers a precision-machined platform designed for DIY completion. This 80% lower receiver is the cornerstone of a custom AR-15 build, offering the same polymer frame technology that has made Polymer80 a trusted name in the industry. Whether you are a first-time builder or a seasoned gunsmith, this component provides the structural integrity and compatibility required for a reliable rifle.

Overview

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver Only is a partially machined receiver that requires final milling and assembly to become a functional firearm component. Manufactured from high-strength, impact-resistant polymer, this lower receiver is designed to accept standard AR-15 lower parts kits and buffer tube assemblies. The 80% configuration means it is not considered a firearm under federal regulations, allowing direct shipment to your door. This specific model features the Rhino texture grip pattern for enhanced control and a flared magazine well for faster reloads.

Features & Specs

• Material and Construction: Reinforced polymer composite with integrated trigger guard and rear takedown pin detent. The RL556V3 – Rhino 80% AR15 Lower Receiver Only weighs approximately 8.4 ounces, reducing overall rifle weight without sacrificing durability.
• Compatibility: Accepts all standard AR-15 lower parts kits, buffer tubes, and pistol grip configurations. The receiver is compatible with mil-spec upper receivers and uses standard AR-15 pivot and takedown pins.
• Machining Requirements: The 80% lower receiver requires removal of the trigger pocket, safety selector hole, and fire control group pocket. Polymer80 provides jigs and tooling kits separately for completing the machining process.

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver Only features a black textured finish that resists solvents and impact. The flared magazine well is optimized for both 5.56 NATO and .223 Remington magazines, ensuring reliable feeding under field conditions. The integral trigger guard eliminates the need for a separate component, simplifying assembly while maintaining strength.

Who It’s For

This product is intended for individuals who possess the tools and skills to complete an 80% lower receiver. It is ideal for hobbyists who want to build a custom AR-15 from the ground up, collectors seeking a unique serial-number-free platform, and shooters who prefer the ergonomic advantages of a polymer frame. The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver Only is not recommended for users who lack experience with drilling, milling, or firearm assembly. It is designed for those who understand the legal and mechanical responsibilities of completing a firearm component. Commercial builders and gunsmiths will appreciate the consistent tolerances and the ability to finish multiple receivers with repeatable results.

Shipping & FFL

Because the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver Only is classified as an unfinished receiver, it does not require transfer through a Federal Firearms License (FFL) holder for initial shipment. However, once you complete the receiver into a functional firearm, you are subject to all applicable federal, state, and local laws regarding possession, transfer, and manufacture. It is your responsibility to verify that completing an 80% lower receiver is legal in your jurisdiction before purchasing. We ship this item directly to residential addresses within the United States where permitted by law. No signature is required for delivery, but we recommend using a secure shipping address. If you have questions about your state’s regulations, consult a local attorney or your state attorney general’s office before completing the transaction. We do not accept returns on completed or modified receivers. All sales are final upon shipment.