Polymer80 Billet AR-15 80% Lower Assembly Kit with Fire/Safe Markings

Description

Stop piecing together your AR-15 lower. This Premium Fire/Safe Marked Billet 80% Lower Assembly is the complete solution for builders who demand quality and convenience. We’ve bundled a top-tier billet receiver with every component you need to finish a functional lower, saving you time and hassle. It’s engineered for straightforward completion and built to last, providing a solid foundation for your rifle. Get ready to build with confidence.

Product Overview

This is a complete AR-15 80% lower assembly kit. The core is a premium billet 80% lower receiver machined from 7075-T6 aluminum and finished in Mil-Spec black anodizing. It comes ready to be finished with a complete lower parts kit, a buttstock, and a buffer tube assembly. The receiver is Fire/Safe marked for a professional look and features critical design upgrades like threaded holes to simplify your build process. This is a one-stop shop for your lower receiver needs.

Key Features

• Complete Kit: Includes billet 80% lower, lower parts kit, buttstock, and buffer tube assembly. No need to source separate components.
• Premium Billet Construction: Machined from solid 7075-T6 aluminum billet for superior strength and durability compared to forged alternatives.
• Fire/Safe Engraved: Professionally marked selector positions for a clean, finished appearance right out of the box.
• Threaded Installation Points: Features a threaded bolt catch release hole and threaded rear takedown detent hole. This eliminates the need for roll pins and makes assembly significantly easier.
• Broached Magwell: Precision broached for smooth, reliable magazine insertion and ejection.
• 100% Made in the USA: Manufactured to strict quality standards right here in the United States.
• No FFL Required: This 80% lower receiver is not a firearm, so it ships directly to your door without Federal Firearms License paperwork.

Technical Specifications

• SKU: P80-013
• Material: Billet 7075-T6 Aluminum
• Finish: Anodized Mil-Spec Black
• Markings: Fire/Safe Selector Engraved
• Magwell: Broached
• Included Hardware: All necessary screws and a hex key for assembly.
• Origin: 100% Made in the USA

Compatibility

This is a standard AR-15/M4 pattern 80% lower receiver. It is compatible with all mil-spec AR-15 upper receivers, barrels, handguards, and triggers. The included lower parts kit and buffer tube assembly are also mil-spec, ensuring broad compatibility with aftermarket stocks, grips, and other accessories. It’s designed to be the universal foundation for your custom rifle build.

Real-World Use Cases

This kit is perfect for the home builder looking to create a personalized AR-15 without the paperwork. It’s ideal for crafting a lightweight hunting rifle, a reliable home defense weapon, or a precision competition gun. The threaded holes make it an excellent choice for first-time builders who want to avoid the frustration of hammering in roll pins. Experienced builders will appreciate the time saved by having a complete kit with a high-quality billet receiver at the core.

Legal & Compliance Notice

This product is intended for lawful use by law-abiding US citizens only. Buyers must be 21+ and comply with all federal, state, and local laws. Polymer80 products are sold legally and for legal purposes only.

Shipping & Trust

Ships fast from the USA. Authentic Polymer80 products. Discreet packaging available.

Frequently Asked Questions

What tools do I need to finish this 80% lower?

You will need a drill press or a sturdy router jig, appropriate drill bits and end mills, and basic armorer’s tools (punches, hammer, screwdrivers). The threaded holes eliminate the need for roll pin punches for the bolt catch and rear takedown pin.

Is the lower parts kit complete?

Yes. The kit includes all springs, detents, pins, the trigger, hammer, disconnector, safety selector, magazine catch, and bolt catch required to complete a functional lower receiver when paired with the finished 80% receiver.

Does this include the buffer spring and buffer?

The listing includes the buffer tube assembly (tube, castle nut, end plate) and buttstock. The buffer spring and buffer weight are typically part of a separate lower parts kit or sold individually; please verify the contents of the included parts kit against your build list.

Ready to build? This Premium Billet 80% Lower Assembly Kit delivers everything you need in one package. Get the strength of 7075-T6 aluminum, the convenience of threaded holes, and the satisfaction of a true DIY build. Add to cart now.

Available for fast shipping to Texas, Florida, Arizona, Nevada, Montana, Wyoming, Idaho, Utah, Alaska, Colorado, Georgia, Tennessee, North Carolina, Virginia, Pennsylvania, Ohio, Michigan, and all other eligible US states.