Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver Only

Build your next custom AR-15 platform with precision and confidence using the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver Only. This component is designed for serious builders who require a reliable, semi-finished foundation for a personal firearm project. As a true 80% lower receiver, it offers the flexibility to complete the build to your exact specifications while maintaining the structural integrity and ergonomic benefits that Polymer80 is known for. Whether you are expanding your inventory or working on a dedicated build, the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver Only provides a cost-effective starting point without compromising on quality.

Overview

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver Only represents a modern approach to firearm customization. This lower receiver is manufactured from high-strength, impact-resistant polymer composite, engineered to meet mil-spec dimensions for compatibility with standard AR15 upper receivers and parts kits. The Rhino model features an integrated trigger guard, a flared magazine well for faster reloads, and an enhanced ergonomic grip angle. As an 80% lower, it requires final machining to complete the fire control group pocket, making it a legal and versatile option for builders who prefer to finish the receiver themselves. The low profile design and textured grip surfaces provide a secure hold in all conditions.

Features & Specs

• Manufacturer: Polymer80 | Category: Parts | Material: Reinforced polymer composite with glass-filled nylon for durability and impact resistance.
• Mil-spec dimensions ensure drop-in compatibility with standard AR15 upper receivers, buffer tubes, and trigger groups.
• Integrated trigger guard, flared magazine well, and ergonomic pistol grip angle reduce handling time and improve control during operation.

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver Only is pre-drilled for selector and safety positions, with a reinforced rear takedown pin lug to withstand repeated use. The receiver is designed for use with standard AR15 lower parts kits and features a flat top profile for optics mounting on compatible uppers. Each unit is inspected for consistent wall thickness and dimensional accuracy before packaging.

Who It Is For

This product is intended for experienced firearm builders, gunsmiths, and commercial retailers who require a reliable 80% lower receiver for custom builds or inventory. The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver Only is suitable for those who possess the necessary tools and knowledge to complete the fire control cavity machining process. It is not a finished firearm and is not intended for casual or first-time builders without proper training. Lawful purchasers must comply with all applicable federal, state, and local laws regarding the possession and completion of 80% receivers.

Shipping & FFL

This item ships directly to your address as it is not a finished firearm and does not require transfer through a Federal Firearms License (FFL) dealer per current BATFE guidelines. However, customers are solely responsible for verifying that their state and local laws permit the possession and completion of 80% lower receivers. Once the receiver is completed and functional, it must comply with all applicable firearms regulations, including serialization requirements where mandated. We recommend consulting with a qualified legal professional before purchasing the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver Only. All sales are final on this item. Shipping is available to contiguous US addresses only, with expedited options at checkout.