The most popular polymer AR-15 80% lower. Worried about cutting and drilling a metal 80% lower? Try this instead! The “RHINO” 80% lower is made from a glass-reinforced nylon composite, the same material used to make handgun frames. It’s incredibly tough and capable of handling centerfire rifle cartridges, but it’s a breeze to cut and drill for beginner builders with basic tools. The RL556v3 features some improvements over its prior models: A threadless pistol grip reduces stress points within the receiver, and the buffer tube housing has been beefed up. It also features a flared magazine well for quicker reloads. NOTE: This lower does not include an 80% jig. The RL556v3 Jig is available here. This lower also works with other AR-type 80% lower jigs. “RHINO” Polymer 80% Lower: What’s Included 80% Polymer AR15 Lower Blank (Mil-spec) Hex Key Set Screw Grip Nut Grip Screw Bolt Catch Pin “RHINO” Polymer 80% Lower Features Works with standard, mil-spec lower parts kits Compatible with mil-spec buffer tube assemblies Uses standard pivot and takedown pins Works with standard AR uppers Accepts mil-spec magazines 100% made in the USA https://80lowerarms.com/product/polymer80-rl556v3-rhino-80-ar15-lower-receiver-only/