Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig

Build your own AR-15 from the ground up with the Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig. This complete kit provides the core component and tooling required to complete a serialized-pattern lower receiver at your workbench. Designed for DIY builders who demand precision without the premium price tag, this Polymer80 kit brings factory-level fitment to your home workshop.

Overview

The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is a pre-machined 80% lower receiver that requires final milling to become a functional AR-15 lower. Manufactured from reinforced polymer, the RL556V3 is compatible with mil-spec AR-15 upper receivers and parts kits. The included jig provides indexed drilling and routing guides to complete the trigger pocket, fire control group holes, and safety selector detent channel. This kit is ideal for builders who want a lightweight, corrosion-resistant lower with the satisfaction of finishing it themselves.

Features & Specs

• 80% complete polymer lower receiver with integrated trigger guard; requires final machining to complete
• Reinforced nylon polymer construction resists impact, temperature extremes, and chemical solvents common to firearms maintenance
• Comes with universal jig system including drill bits, end mill, and step-by-step instructions for standard AR-15 lower completion
• Accepts all mil-spec AR-15 upper receivers, buffer tubes, grips, and stock assemblies
• Weight: approximately 0.8 pounds (lower receiver only); total kit weight under 2.5 pounds

Who It Is For

This product is designed for the experienced firearms builder who understands the mechanical requirements of completing an 80% lower receiver. It is not for first-time assemblers without prior knowledge of AR-15 lower machining. The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig suits hobbyists who want to customize their build with complete control over the final fit, finish, and parts selection. It is also suitable for gunsmiths adding a lightweight polymer option to their custom build inventory. Before purchasing, confirm that you are legally permitted to manufacture a firearm for personal use under federal, state, and local laws.

Shipping & FFL

This Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig is classified as an unfinished receiver and does not constitute a firearm under federal law. As such, it ships directly to your residence or business address without requiring transfer through a Federal Firearms License (FFL) dealer. However, you must comply with all applicable federal, state, and local laws regarding the possession and completion of 80% receivers. Some states and municipalities impose restrictions on the purchase, possession, or serialization of unfinished receivers. It is your sole responsibility to verify legality before ordering. Standard shipping rates apply; we do not ship to PO boxes or APO/FPO addresses for this item. No signature is required unless the carrier demands it for oversized packages.