Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig

Overview

Building your own AR-15 from the ground up is one of the most rewarding projects a shooter can take on. The Polymer80 RL556V3 – Rhino 80% AR15 Lower Receiver with Jig gives you a solid, lightweight foundation that’s ready for your personal touches. This 80% lower receiver is precision-molded from reinforced polymer, designed to accept standard AR-15 parts kits, and comes with the necessary jig to help you complete the machining at home. Whether you’re a first-time builder or a seasoned hobbyist, this kit simplifies the process without cutting corners on reliability. The polymer80 rl556v3 – rhino 80% ar15 lower receiver with jig is built for those who want a durable, affordable platform they can finish with basic tools and a few hours of focused work.

Features & Specs

We’ve handled a lot of lowers over the years, and this one stands out for its smart engineering. The Polymer80 RL556V3 uses a high-impact, glass-reinforced nylon polymer that resists cracking and holds up to repeated use. It’s compatible with mil-spec AR-15 upper receivers, trigger groups, and buffer tubes, so you won’t be hunting for odd parts. The integrated jig is key here: it’s pre-drilled with guide holes for the trigger pocket, safety selector, and hammer pin, making the milling process more straightforward than many other 80% kits. Here’s what you’re getting:

• 80% finished lower receiver – requires final machining of the fire control pocket and trigger pin holes
• Complete jig with drill bushings for precise alignment with standard AR-15 LPK components
• Reinforced polymer construction with textured grip areas for positive handling

This isn’t a flimsy plastic frame. The material is thick where it needs to be, and the internal geometry matches the original Polymer80 Gen2 design, which has been field-tested by thousands of builders. The polymer80 rl556v3 – rhino 80% ar15 lower receiver with jig includes all the hardware you need to get started, minus the tools and finishing bits. Expect a snug fit with most upper receivers, and the jig’s stainless steel bushings should hold up through multiple builds if you’re careful.

Who It’s For

This lower receiver is ideal for the DIY-minded shooter who wants a personal rifle without the full gunsmithing expense. If you’ve got a drill press or a handheld router and a steady hand, you can take this from raw to functional in an afternoon. It’s also a great choice if you’re looking to learn the mechanics of the AR-15 platform hands-on, because you’ll be intimately involved in the critical pin placement and pocket dimensions. The polymer80 rl556v3 – rhino 80% ar15 lower receiver with jig is not for someone who wants a drop-in solution – it requires careful work. But for the builder who enjoys the process, it’s a satisfying project that yields a reliable, lightweight shooter. We recommend it for intermediate to advanced hobbyists, and first-timers who are willing to watch a few tutorials and take their time.

Shipping & FFL

Because the Polymer80 RL556V3 is an 80% receiver and not a finished firearm, it does not require transfer through a Federal Firearms License (FFL) for shipment within the United States. You can order it directly to your doorstep. However, please check your state and local laws before purchasing, as some jurisdictions regulate 80% lowers or require serialization after completion. We ship this item via standard ground carrier, and we include the jig and all components in the same box. No FFL paperwork is needed from you at checkout, but we do require that you are 18 years or older to purchase. Always verify that finishing this lower is legal in your area – we cannot be responsible for local compliance.