Premium Fire/Safe Marked Billet 80% Lower Assembly | Polymer80
About this product
Complete Your AR-15 Build with the Premium Fire/Safe Marked Billet 80% Lower Assembly
Elevate your AR-15 build with this all-in-one kit from Polymer80, featuring a high-quality billet 80% lower receiver, lower parts kit, butt stock, and buffer tube assembly. Designed for enthusiasts and builders, this assembly ensures a seamless and frustration-free experience with enhanced features like threaded bolt catch and rear takedown detent holes for easy installation.
Key Features and Benefits
- FIRE/SAFE Engraved Lower: Crafted from 7075-T6 billet aluminum with a broached magwell for superior durability and performance.
- Threaded Holes: Includes screws and hex key for effortless parts kit installation, reducing common build challenges.
- No FFL Required: As an 80% lower, it ships directly to your door without federal paperwork, supporting your right to build.
- 100% Made in the USA: Proudly manufactured to mil-spec standards for reliability and compliance.

Technical Specifications
- Material: 7075-T6 Aluminum (Billet)
- Color: Anodized Mil-Spec Black
- Compatibility: Standard AR-15 platforms; works with most aftermarket components.
- Includes: Lower parts kit (hammer, trigger, pins, springs, etc.), adjustable carbine stock, buffer tube assembly with spring and hardware.
Why Choose This Kit?
Backed by Polymer80’s reputation for innovation and quality, this assembly is ideal for both novice and experienced builders. It offers everything needed to complete a functional lower receiver, saving time and ensuring compatibility. For detailed instructions, refer to our guides and videos to assist with assembly.
Upgrade your build today with this premium, American-made solution that emphasizes ease, reliability, and compliance with firearm regulations.
What's in the box
- Premium Fire/Safe Marked Billet 80% Lower Assembly | Polymer80