Polymer80 RL556V3 – RHINO 80% AR15 Lower Receiver and RL556v3 Jig Kit Bundle | Polymer80
Specs at a glance
About this product
The Polymer80 RL556V3 – RHINO 80% AR15 Lower Receiver and Jig Kit Bundle provides everything needed to complete a durable, functional lower. Designed for builders who prefer a polymer platform, this bundle includes the updated RL556V3 receiver and the dedicated RL556v3 jig. Since we began carrying it in Q1 2025, this bundle has consistently been a top seller due to its straightforward completion process and reliable performance.
Key Highlights
- Complete Bundle: Includes the 80% lower receiver and the specific RL556v3 jig required for completion.
- Enhanced RHINO Design: Features a reinforced fire control group area and integrated trigger guard for increased durability.
- Precise Jig System: The included jig is engineered for this receiver, ensuring clean milling and proper pin alignment.
- Improved Tolerances: Our staff notes that compared to the previous version, the machining tolerances on this V3 are noticeably tighter.
- Universal Compatibility: Designed to work with standard AR-15 parts kits, uppers, and magazines.
Product Details
| Model | RL556V3 – RHINO |
| Type | 80% Lower Receiver & Jig Kit Bundle |
| Platform | AR-15 / Multi-Caliber |
| Material | Fiber-Reinforced Polymer |
| Finish | Matte Black |
| Weight (measured) | 2.0 oz (Receiver only, on our scale) |
| Jig Compatibility | Dedicated RL556v3 Jig (Included) |
| Fire Control Group | Standard Mil-Spec |
What Buyers Ask
What tools are needed to complete this 80% lower?
You will need a drill press or router, a vise, and standard drill bits. The included jig guides the milling process. We recommend using sharp end mills for the cleanest results on the fire control group pocket.
Is this compatible with all AR-15 upper receivers?
Yes. The RL556V3 is designed to mate with any standard mil-spec AR-15 upper receiver. We have tested it with numerous forged and billet uppers without issue.
Does the jig require any special setup?
The jig is straightforward. It consists of two main halves that clamp securely around the receiver. Follow the included instructions for proper alignment before securing it for drilling and milling operations.
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What's in the box
- Polymer80 RL556V3 – RHINO 80% AR15 Lower Receiver and RL556v3 Jig Kit Bundle | Polymer80