Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig

Overview

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig represents a refined step in the 80% receiver market. Designed for builders who demand precision and durability from a polymer platform, this RL556V3 variant incorporates an integrated rear takedown lug reinforcement and a steel safety selector pocket. The included jig system simplifies the milling process, allowing you to complete the lower with standard drill press or hand tools. Whether you are assembling a lightweight patrol rifle or a custom AR-15 build, the polymer80 rl556v3 – rhino 80% ar15 lower receiver with jig delivers a solid foundation without the weight of billet aluminum.

Features & Specs

This complete kit includes the RL556V3 lower receiver and the matching Polymer80 jig. The receiver is manufactured from high-impact polymer with glass-fiber reinforcement, offering corrosion resistance and reduced weight compared to standard aluminum lowers. The jig is precision-machined from aircraft-grade 6061 aluminum and aligns directly with the receiver’s pre-indexed pockets for accurate drilling and routing.

• Integrated steel locking block for rear takedown pin durability; compatible with mil-spec upper receivers and buffer tubes
• Pre-drilled pilot holes for trigger, hammer, and safety selector pockets; jig includes hardened steel drill bushings
• Accepts all standard AR-15 lower parts kits, pistol grips, and collapsible stocks; no proprietary components required

Who It’s For

The polymer80 rl556v3 – rhino 80% ar15 lower receiver with jig is built for the home gunsmith who values a streamlined workflow. It suits first-time 80% builders because the jig reduces setup time and minimizes common alignment errors. Experienced builders will appreciate the reinforced polymer structure and the ability to finish the lower without a milling machine. Law enforcement and civilian shooters looking for a lightweight, corrosion-free platform for range use or competition will find this receiver meets their needs. The RL556V3 is also an ideal choice for those who prefer to complete a firearm over several sessions, as the polymer material does not require anodizing or finishing after machining.

Shipping & FFL

This product is an 80% lower receiver and is not classified as a firearm by the ATF. It may be shipped directly to your residence or business without an FFL transfer. No serial number is required, and you are not required to use an FFL dealer for delivery. However, once you complete the receiver into a functional firearm, you must comply with all applicable federal, state, and local laws regarding ownership and transfer. Some states and municipalities restrict or prohibit the possession or completion of 80% receivers. It is your responsibility to verify that you may legally purchase, possess, and complete this product in your jurisdiction. We do not assume liability for any legal consequences arising from the purchase or use of this item. By purchasing the polymer80 rl556v3 – rhino 80% ar15 lower receiver with jig, you confirm that you are legally eligible to own a firearm and that the completed firearm will not be transferred to a prohibited person. If you have questions about your state’s requirements, consult a qualified attorney before ordering.