The RL556v3 is Polymer80’s answer for builders who want a polymer AR lower that doesn’t feel like cheap plastic. Their proprietary composite holds up better than standard polymer receivers, with a solid core design that adds rigidity where it counts. The flared magwell makes reloads smoother, while the reinforced buffer tube area addresses a common failure point on polymer lowers.
This is a true 80% lower – you’ll need to mill out the fire control pocket yourself using the included jig and tools. The threadless pistol grip design is specific to P80 rifle lowers, so standard AR grips won’t work without modification. Comes with everything you need to complete the lower except a drill press and vise.
- Proprietary polymer composite for durability
- Flared magwell for positive magazine insertion
- Reinforced buffer tube housing
- Includes jig, drill guide, and milling tools
- Threadless pistol grip design (P80-specific)
Good option for lightweight builds or when you want to avoid FFL paperwork, but not ideal for high-round-count duty use.
Product Details
The RL556v3? features Polymer80?s proprietary polymer composite, a solid core design, flared magwell, and beefier mil-spec buffer tube housing. The pistol grip area features a unique threadless design specific to Polymer80 rifle lowers.\n\n\nThe kit includes:\n\n\n80% Polymer AR15 Lower Receiver (Mil-spec)\nPolymer Jig\nTrigger Hole Drill Guide\nDrill Bits and End Mill\n\n \n\nAvailable colors:\n\nBlack, White, FDE, OD Green, Gray
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