Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver and RL556V3 Jig Kit Bundle

For builders who value precision, compliance, and control over their AR-15 platform, the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver and RL556V3 Jig Kit Bundle delivers a complete, turnkey solution for completing your own 80% lower. This bundle pairs the industry-recognized Rhino lower receiver with the dedicated RL556V3 jig system, eliminating guesswork and tool compatibility issues. Whether you are a first-time builder or a seasoned gunsmith, this bundle provides the foundation for a reliable, custom firearm without the need for serialization or FFL transfer.

Overview

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver and RL556V3 Jig Kit Bundle is a purpose-engineered kit designed for the DIY builder. The Rhino lower is machined from a proprietary polymer composite that offers structural rigidity comparable to aluminum while remaining lighter and corrosion-resistant. The included RL556V3 jig kit is precision-milled to match the lower’s pocket geometry, guiding your router or drill press for accurate trigger pocket and pin hole completion. This bundle is sold as a non-firearm item and requires finishing before use.

Features & Specs

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver and RL556V3 Jig Kit Bundle includes the following components and specifications:

• Polymer80 Rhino 80% lower receiver: reinforced polymer composite, compatible with standard AR-15 mil-spec upper receivers and parts kits, includes integrated trigger guard
• RL556V3 jig kit: includes hardened steel drill bushings, alignment pins, and a multi-axis clamping system for secure workpiece hold during milling
• Complete hardware pack: includes all necessary screws, washers, and guide rods for jig assembly; no additional tooling required beyond a router or drill press

Additional specifications:

• Manufacturer: Polymer80
• Category: Build Kits
• Material: Proprietary polymer composite (glass-reinforced nylon)
• Weight: 9.2 oz (lower only)
• Compatibility: All standard AR-15 calibers (.223/5.56, .300 Blackout, 9mm with adapter)

• Jig reusability: the RL556V3 jig is reusable for multiple lower builds; replacement bushings available separately
• Finish: textured grip surface with anti-slip panels; available in black only
• Fire control group: accepts all mil-spec and drop-in triggers

Who It’s For

This bundle is intended for individuals who wish to complete an unfinished lower receiver for personal use, in compliance with all applicable federal, state, and local laws. It is ideal for the hobbyist seeking a hands-on building experience without the paperwork and transfer fees associated with a serialized lower. The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver and RL556V3 Jig Kit Bundle is also suited for builders who want a lightweight, durable platform for competition, range use, or defensive purposes. It is not designed for commercial resale or for individuals prohibited from possessing firearms.

Shipping & FFL

Because the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver and RL556V3 Jig Kit Bundle is classified as an unfinished, non-serialized receiver, it ships directly to your doorstep without the need for an FFL transfer. No background check is required at the time of purchase. However, it is your responsibility to verify that this product is legal to own and complete in your state and municipality. Some states and localities restrict or prohibit the possession or completion of 80% lowers. By purchasing this bundle, you certify that you are not prohibited by law from owning or building a firearm. This product is sold for personal use only and may not be transferred or sold as a finished firearm without proper licensing. All sales are final. Shipping is available to all U.S. states and territories where legal, with standard rates applied at checkout. Signature may be required upon delivery.