About this product

Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig represents a precision-engineered platform for builders seeking a hands-on approach to firearm assembly. This component is a partially machined lower receiver, requiring final milling to complete the fire control group pocket and trigger pin holes. Designed for the AR15 platform, this unit includes the necessary jig to guide the finishing process, offering a build experience that aligns with current regulatory frameworks for unserialized firearm components.

Overview

This product is a complete kit containing the Polymer80 RL556V3 Rhino 80% lower receiver and the corresponding jig system. The receiver is fabricated from reinforced polymer, utilizing a proprietary blend that balances structural rigidity with weight reduction. The jig is constructed from hardened steel and aluminum, providing repeatable alignment for drilling and routing operations. This kit is intended for individuals who possess the tools and skill set to complete the machining process, resulting in a functional AR15 lower receiver that is not serialized by the manufacturer.

Features & Specs

• Manufacturer: Polymer80; Category: Parts; Material: High-impact reinforced polymer composite with glass-fiber fill for dimensional stability under thermal load.
• Compatibility: Designed for standard AR15 mil-spec upper receivers, buffer tubes, and trigger groups; accepts all standard AR15 magazines.
• Jig system: Integrated drill and router template with hardened steel bushings; includes alignment pins and clamping mechanism for secure workpiece fixation.

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig features a textured grip angle optimized for ergonomic control. The magazine well is flared for faster reloads, and the trigger guard is integrated into the lower receiver body to reduce snag points. The jig provides indexing for the safety selector hole, hammer pin, and trigger pin locations, ensuring compliance with the receiver’s pre-machined pocket geometry.

Who It’s For

This kit is intended for experienced firearm builders who are comfortable with basic machining operations, including drilling and routing. It is not recommended for first-time builders without prior exposure to AR15 assembly or use of a router jig. The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is suited for individuals who wish to complete a lower receiver in a home workshop setting, provided they have access to a drill press, router, and appropriate cutting bits. This product is not a finished firearm and requires final machining to become functional.

Shipping & FFL

This item is an 80% lower receiver, defined as an unfinished frame that is not subject to federal firearm licensee (FFL) transfer requirements when shipped. However, specific state and local laws may apply. By purchasing the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig, the buyer acknowledges responsibility for compliance with all applicable federal, state, and local regulations. The receiver ships directly to residential addresses where legally permissible. No FFL transfer is required for this product. Check your local statutes before ordering.

• Shipping: Free ground shipping on orders over $99; estimated delivery 5-7 business days within the contiguous United States.
• FFL disclaimer: This 80% lower receiver is not a firearm and does not require transfer through a Federal Firearms Licensee. Buyer assumes all liability for legal compliance.
• Return policy: Unopened kits may be returned within 30 days of receipt; opened jig kits are non-returnable due to consumable components.