Premium 80% Lower Fire/Safe Marked – Billet | Polymer80

About this product

Premium Billet 80% Lower with Fire/Safe Marking

Our Premium Billet 80% Lower is engineered for effortless assembly, featuring a redesigned receiver with key enhancements. This Polymer80 product includes a threaded bolt catch release hole and a threaded rear takedown detent hole, eliminating the need for roll pins and loose springs. These upgrades ensure a quicker, simpler installation of your lower parts kit with minimal tools required. The lower comes with all necessary screws for the threaded fittings, making it ideal for both beginners and experienced builders.

Technical Specifications

• Compatibility: 5.56/.223, 300 BLK, 6.5 Grendel
• Construction: Billet 6061-T6 Aluminum for superior durability
• Finish: Type III Hardcoat Anodizing in Matte Black
• Fitment: 100% Mil-Spec for reliable performance
• Features: Broached magwell, integrated heavy-duty trigger guard, and Fire/Safe engravings
• Origin: 100% Made in the USA, ensuring high quality and compliance

Why Choose This 80% Lower?

This billet lower is perfect for building a custom AR-15, offering enhanced ease of use and robust construction. It’s designed to work seamlessly with standard lower parts kits, buffer tube kits, and upper assemblies. Whether you’re crafting a rifle for sport, hunting, or personal defense, this receiver provides a solid foundation with its precision engineering and user-friendly design.

Assembly and Support

To complete your build, you’ll need a lower parts kit, buffer tube kit, and upper assembly. For guidance, refer to our step-by-step picture guides and the Ultimate Guide on How to Build an AR-15, available on our website. If you’re new to 80% lowers, our FAQ section explains everything you need to know to get started safely and legally.