Description

Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver and RL556v3 Jig Kit Bundle

Designed for the serious builder, the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver and RL556v3 Jig Kit Bundle delivers a complete, precision-engineered platform for completing your own AR-15 lower. This bundle integrates the reinforced RL556v3 Rhino lower receiver with the dedicated RL556v3 jig system, providing all critical tooling and alignment fixtures required to finish the 80% blank. Each component is machined from Polymer80’s proprietary high-impact polymer blend, ensuring dimensional stability and compatibility with mil-spec upper receivers and parts kits. The jig kit includes hardened steel drill bushings, alignment pins, and a rigid clamp frame designed to maintain repeatable accuracy across multiple builds.

Overview

This bundle consolidates the RL556v3 Rhino lower receiver with the specialized jig kit necessary to complete the fire control pocket and trigger pin holes. The RL556v3 lower features integral rear takedown pin detent retention, an oversized trigger guard, and a flared magazine well for rapid reloads. The accompanying jig kit eliminates guesswork by providing indexed drill guides for the trigger and hammer pin holes, as well as a guide for the safety selector detent channel. The polymer80 rl556v3 – rhino 80% ar15 lower receiver and rl556v3 jig kit bundle is optimized for use with standard hand tools or a drill press, reducing the need for advanced machining equipment. Each receiver is serialized with a unique identification number for compliance tracking, and the jig is reusable for future builds using the same RL556v3 pattern.

Features & Specs

• Reinforced polymer construction with integral steel trigger pin inserts for extended service life; compatible with all mil-spec AR-15 lower parts kits and buffer tube assemblies
• Dedicated RL556v3 jig kit includes a CNC-machined aluminum clamp frame, hardened steel drill bushings (1/8-inch and 5/32-inch), alignment pins, and a rear pocket drilling template
• Integrated trigger guard, flared magazine well, and oversized bolt catch recess for ambidextrous operation; includes a detent channel for the rear takedown pin spring and buffer retainer

The RL556v3 lower receiver is drilled and tapped for a standard 4-40 set screw to retain the rear takedown pin detent, eliminating the need for a buffer tube during assembly. The jig kit provides a 0.250-inch guide for the fire control pocket depth and a 0.154-inch guide for the trigger pin. The polymer80 rl556v3 – rhino 80% ar15 lower receiver and rl556v3 jig kit bundle weighs approximately 1.8 pounds and fits within standard ATF guidelines for 80% receivers requiring machining to function. The jig frame includes a quick-release clamp and integrated leveling feet for benchtop stability. Each bundle is packaged with a printed instruction manual and access to Polymer80’s online video build guide.

Who It Is For

This bundle is intended for experienced firearm builders and enthusiasts who require a repeatable, high-tolerance jig system for completing the RL556v3 lower receiver. It is well-suited for individuals who plan to build multiple AR-15 platforms and want a dedicated jig that maintains alignment across successive uses. The polymer80 rl556v3 – rhino 80% ar15 lower receiver and rl556v3 jig kit bundle is also appropriate for gunsmiths or hobbyists seeking a complete solution without sourcing separate tooling. Builders should possess basic familiarity with drilling and pin installation procedures. This product is not recommended for first-time builders without prior experience in finishing 80% receivers, as improper machining can result in an unsafe or non-functional lower.

Shipping & FFL

This item ships as a non-serialized 80% receiver and jig kit combination. No Federal Firearms License (FFL) is required for purchase or shipping. However, once the receiver is completed by machining the fire control pocket and installing the trigger group, it becomes a functional firearm frame and must be serialized in accordance with all applicable federal, state, and local laws. The buyer assumes full responsibility for compliance with all statutes regarding the manufacture and possession of firearms. Check your local regulations before ordering. Some states and municipalities restrict or prohibit the possession or completion of 80% receivers. This product will not be shipped to jurisdictions where such restrictions apply. By purchasing this bundle, you confirm that you are legally eligible to possess and complete this receiver under all applicable laws.