Polymer80 RL556V3 – RHINO 80% AR15 Lower Receiver with Jig

Description

Product Overview

The Polymer80 RL556V3 RHINO 80% AR-15 Lower Receiver with Jig is a complete solution for the enthusiast looking to legally build a custom, lightweight AR-platform rifle. This product is a “receiver blank,” meaning it is not a firearm as shipped and requires machining to become a functional lower receiver. It is designed for experienced hobbyists and builders who understand the legal framework (specifically, that it is for personal use only, not for resale, and manufacturing a firearm for oneself must comply with all federal, state, and local laws). The primary use of the finished lower is to serve as the foundational component of a semi-automatic AR-15 rifle, compatible with a vast array of standard upper receivers and parts kits. Its Flat Dark Earth finish offers a popular, tactical aesthetic that pairs well with a variety of builds.

Key Features

• Complete 80% Lower & Jig System: The included, precision-machined jig is engineered specifically for the RL556V3, providing the necessary guides for drilling and milling. This eliminates guesswork and simplifies the completion process for builders with the proper tools and workshop skills.
• Weapons-Grade Polymer Construction: Made from a reinforced, high-strength polymer composite, this lower receiver is engineered for durability and impact resistance. The result is a component that is exceptionally lightweight yet capable of withstanding the rigors of use.
• Full AR-15 Compatibility: Once completed, the RL556V3 lower accepts all standard AR-15 lower parts kits (LPKs), fire control groups, buffers, and stocks. It is designed to mate seamlessly with mil-spec AR-15 upper receivers, ensuring reliable function.
• Optimized for Lightweight Builds: The significant weight reduction compared to aluminum lowers makes the Rhino an ideal choice for builders aiming to create an ultra-lightweight rifle, beneficial for hunting, extended carry, or competition use.
• Enhanced Ergonomic Design: Polymer80 incorporates thoughtful design elements into the molding, such as an integrated trigger guard and a textured grip area, providing a solid foundation that is comfortable to handle during the build process and in final use.
• Available in Multiple Finishes: Offered in Flat Dark Earth (as shown here), Black, and Ghost Gray, allowing builders to select a color that matches their overall rifle concept and personal preference.

Performance & Applications

The completed Polymer80 Rhino lower receiver is built for performance in specific applications where its material advantages shine. It is crucial to understand that its performance is contingent on a proper build using quality components and correct completion of the receiver blank.

Ultra-Lightweight Hunting & Varmint Rifle: By pairing the lightweight polymer lower with a carbon fiber or pencil-profile barrel upper, builders can create a rifle that is easy to carry over long distances in the field. The reduced weight lessens fatigue, making it an excellent choice for hunters who cover significant ground.

Dedicated Training & Rimfire Builds: The Rhino is an excellent, cost-effective foundation for a dedicated .22 Long Rifle conversion build or a training rifle. The polymer construction is more than sufficient to handle the minimal recoil of rimfire cartridges, and the light weight is advantageous for newer shooters or extended practice sessions.

Custom “Backpack” or Survival Rifle: For builders interested in a highly portable AR platform, the Rhino’s light weight is a major asset. When combined with a folding stock adapter and a short-barreled upper (in compliance with NFA regulations), it can form the core of a compact, packable system where every ounce matters.

About Polymer80

Polymer80 is a recognized leader in the manufacturing of advanced polymer frames and receivers for the builder community. The company has established its authority through a commitment to engineering, material science, and precise manufacturing. Their expertise is demonstrated in the thoughtful design of products like the RL556V3, which are not simple copies of existing designs but are instead re-engineered from the ground up to leverage the benefits of modern polymer composites. Polymer80 invests in research and development to create components that meet specific performance criteria, such as weight reduction and enhanced ergonomics. Their widespread use and discussion within the legal build-to-own community serve as a testament to their product’s functionality and the brand’s understanding of the niche requirements for 80% components. They emphasize compliance and responsible ownership, directing builders to understand and follow all applicable laws.

Make Your Decision

The Polymer80 RL556V3 Rhino presents a clear value proposition: a lightweight, durable, and fully compatible AR-15 lower receiver system for the informed hobbyist. Its inclusion of a dedicated jig streamlines the completion process. Your decision should be based on your desire for a lightweight build, your comfort with the required machining steps, and a thorough review of the legal landscape governing such projects. If your goal is to build a custom rifle where weight is a critical factor and you possess the requisite workshop skills, the Rhino in Flat Dark Earth is a purpose-driven and reliable foundation for your project.

Technical Specifications

Frequently Asked Questions