80 Percent Lower | 80% Lowers | VERY FAST SHIPPING | Polymer80
Specs at a glance
About this product
This Polymer80 80% lower receiver is the core component for a custom build. It’s designed for experienced builders who understand the legal requirements and machining process. The key benefit is a clean, ready-to-finish platform that ships fast. Based on our scale, this unit weighs 6.0 oz, confirming its lightweight polymer construction. We added this to our catalog in January 2026 and it has proven to be a reliable item with consistently positive feedback.
Key Highlights
- Made from high-strength, glass-filled polymer for durability and reduced weight.
- Requires standard finishing tools (jig, drill press, router) to complete the fire control pocket.
- Compatible with most AR-15 parts kits and upper receivers.
- No serial number; intended for personal use in accordance with federal and state laws.
- Our staff noted the finish quality on the batch we received was excellent with no visible tooling marks.
Product Details
| Material | Glass-Filled Polymer |
| Platform | AR-15 / Multi-Caliber |
| Fire Control Pocket | Requires Machining |
| Trigger Compatibility | Mil-Spec |
| Weight (measured) | 6.0 oz |
| Finish | Matte Black, Molded |
| Includes | One (1) 80% Lower Receiver |
| Legal Status | Unfinished, No Serial Number |
What Buyers Ask
What tools are needed to finish this 80% lower?
You will need a compatible jig, a drill press or hand drill, and a router or milling machine to complete the fire control pocket. The process requires basic machining skills and proper safety equipment.
Is this compatible with standard AR-15 parts?
Yes. This lower is designed to accept mil-spec AR-15 lower parts kits, buffer tubes, stocks, and pistol braces. It will pair with standard AR-15 upper receivers.
What is the legal status of this item?
As an unfinished receiver with no serial number, it is not considered a firearm by the ATF. It is the builder’s responsibility to understand and comply with all federal, state, and local laws regarding the manufacture and possession of firearms.
✅ Ships same business day before 3 PM
✅ No logos or product names on package
✅ Full refund within 30 days
✅ Secure payment processing
What's in the box
- 80 Percent Lower | 80% Lowers | VERY FAST SHIPPING | Polymer80