Polymer80 Original Forged 80% Lower – Fire/Safe Marked, Anodized Black

$59.40

This is the one that started it for a lot of builders. Our original forged 80% lower isn’t just a part; it’s the foundation. Tens of thousands of custom AR-15s have been built on this exact lower. If you want to build a rifle that’s truly yours, from the ground up, this is where you start.

We don’t cut corners. It’s forged from 7075-T6 aluminum billet—the same spec as issued military receivers—right here in the U.S. Then we give it a proper Type III Hardcoat Anodized finish in matte black. This isn’t paint; it’s a hardened surface that resists wear and matches any mil-spec upper you pair it with. The fire and safe markings are cleanly engraved, and the magwell is professionally broached for smooth, reliable magazine changes.

Build with confidence. This blank is 100% mil-spec. Every standard AR-15 parts kit, trigger, grip, buffer tube, and stock will drop right in. It’s designed for calibers like 5.56/.223, 300 Blackout, and 6.5 Grendel. You supply the tools, the time, and the vision. We supply a rock-solid, American-made starting point that you won’t find fault with.

For under sixty bucks, you get a forged lower that’s ready for your jig and your craftsmanship. This is how you build a rifle with no serial number, no paperwork, and no compromise on quality.

Specifications:

• Compatibility: 5.56/.223, 300 BLK, 6.5 Grendel
• Material: Forged 7075-T6 Aluminum
• Finish: Type III Hardcoat Anodizing (Matte Black)
• Fitment: 100% Mil-Spec
• Markings: Fire & Safe Selector Engraved
• Feature: Broached Mil-Spec Magwell
• Origin: 100% Made in the USA

Note: This is an 80% lower receiver, often referred to as a receiver blank or unfinished receiver. It requires machining and finishing to become a functional firearm component. It is not a firearm and is sold as a metal forging. Buyer is responsible for compliance with all federal, state, and local laws.