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

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver and RL556V3 Jig Kit Bundle offers a complete solution for builders seeking a serialized, 80% platform that pairs with a dedicated finishing jig. This bundle combines the RL556V3 Rhino lower receiver with the RL556V3 jig kit, providing the essential tooling to complete your AR15 lower without the need for third-party fixtures. Designed for users who require a precise, repeatable machining process, this bundle streamlines the build from raw receiver to functional lower.

Overview

This bundle is engineered around the Polymer80 RL556V3 Rhino lower receiver, an 80% forged 7075-T6 aluminum unit that requires final machining of the trigger pocket, fire control group holes, and selector detent channel. The included RL556V3 jig kit is purpose-built for this specific receiver, featuring hardened steel drill bushings and a clamping system that indexes directly onto the receiver’s external geometry. The jig eliminates guesswork by providing fixed drill guides for the hammer pin, trigger pin, and safety selector holes, while the included router template guides the trigger pocket cut. The bundle is intended for builders who want a matched receiver and jig system that minimizes alignment errors and produces a consistent, repeatable lower.

Features & Specs

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver is manufactured from 7075-T6 aluminum, hard-coat anodized per Mil-A-8625 Type III, Class 2. The receiver is compatible with standard AR15 mil-spec upper receivers, buffer tubes, and trigger groups. The jig kit includes a CNC-machined aluminum clamping frame, hardened steel drill bushings for 0.154-inch and 0.250-inch pin holes, a router template with integrated pocket guides, and all necessary mounting hardware. The jig accepts standard 1/4-inch router bits and hand drills with 3/8-inch chucks. The bundle ships as a complete kit with the lower receiver, jig, drill bushings, router template, and hardware. No tooling is included beyond the jig components.

• Lower receiver: 80% forged 7075-T6 aluminum, Type III hard-coat anodized, compatible with mil-spec AR15 parts
• Jig kit: Aluminum clamping frame with hardened steel drill bushings for trigger pin, hammer pin, and safety selector
• Router template: Integrated pocket guide for trigger cavity machining; accepts standard 1/4-inch router bits
• Includes: RL556V3 lower receiver, RL556V3 jig frame, drill bushings, router template, mounting hardware, and instruction manual
• Compatibility: Works with standard AR15 lower parts kits, buffer tubes, and pistol grip configurations

Who It Is For

This bundle is intended for experienced firearm builders who understand the legal requirements and technical steps involved in completing an 80% lower receiver. It is suitable for individuals who prefer a serialized receiver with a matched jig system to ensure precise alignment during the machining process. The RL556V3 jig kit is designed for use with a handheld router and drill press or hand drill; it is not compatible with CNC milling machines. This product is not for first-time builders without prior experience using power tools on aluminum or without a clear understanding of federal, state, and local firearms laws regarding the manufacture of firearms for personal use. The bundle is purpose-built for hobbyists and professionals who require a reliable, repeatable method for completing a single lower receiver without purchasing separate jigs or adapters.

• Experienced builders with prior 80% lower finishing experience
• Builders requiring a matched jig system for the RL556V3 receiver
• Individuals with access to a router, drill press, or electric hand drill
• Hobbyists who prefer serialized receivers for inventory tracking or compliance

Shipping & FFL

This item is classified as a firearm receiver and must be shipped to a Federal Firearms License (FFL) holder for transfer. All federal, state, and local laws apply. The buyer is responsible for verifying that their chosen FFL dealer will accept and process the transfer, and for paying any applicable transfer fees. Upon purchase, our team will contact you to confirm your FFL dealer’s information. Shipment will occur after FFL verification. No returns or exchanges are accepted on serialized firearm components. The bundle ships in a single box containing the lower receiver and the jig kit. The RL556V3 jig kit itself is not a firearm and does not require FFL transfer.

• Must ship to a valid FFL dealer for transfer; no direct-to-consumer shipments
• Buyer must provide FFL dealer contact information at checkout or within 24 hours
• Applicable federal, state, and local laws apply; buyer is responsible for compliance
• No returns or exchanges on serialized receivers; jig kit is non-firearm and shipped with receiver