New Release: MP5 RL556v3 80% AR15 Lower – White

Just released for 2026. One of our newest catalog additions. Fully in-stock, shipping now.

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.

The kit includes:

• 80% Polymer AR15 Lower Receiver (Mil-spec)
• Polymer Jig
• Trigger Hole Drill Guide
• Drill Bits and End Mill

Available colors:

Black, White, FDE, OD Green, Gray