Polymer80 G150 AR-15 80% Lower Receiver Kit with Jig – Gray

Description

Stop piecing together your 80% lower project. The Polymer80 G150 AR-15 80% Receiver Kit delivers a complete, professional-grade system in one box. Engineered with the Phoenix2 polymer composite, this lower is built tougher with a solid core and reinforced critical areas. We include the exact jig and bits required for a clean, precise finish. This is the straightforward path to building a reliable AR-15 on your terms.

Product Overview

The Polymer80 G150 is a Gen2, 80% lower receiver kit designed for the builder who demands a complete package. It’s not just a blank; it’s a system. The gray Phoenix2 polymer composite receiver is paired with the dedicated J150 jig and all the correct tooling. The design focuses on durability where it counts: a solid core for strength, a stiffened magwell to prevent flex, and a true MILSPEC buffer tube housing for compatibility with standard stocks and pistol braces. This kit eliminates guesswork and multiple orders.

Key Features

• Phoenix2 Polymer Composite: Advanced material formulation for increased impact resistance and dimensional stability over previous generations.
• Solid Core Design & Stiffened Magwell: Eliminates hollow cavities, providing a solid foundation for your fire control group and ensuring magazine insertion and ejection is consistently smooth without flex.
• MILSPEC Buffer Tube Housing: Machined to standard specifications, guaranteeing compatibility with the vast ecosystem of AR-15 buffer tubes, stocks, and pistol braces.
• Complete Jig System (J150): Precision-machined jig with all necessary pilot holes and guides for drilling and milling the fire control group pocket and trigger pin holes.
• Included Professional Tooling: Comes with the specific 7/16″ end mill bit for milling the FCG pocket, plus 5/16″ and 3/8″ drill bits for the selector and trigger/hammer pin holes. A 1/16″ Allen wrench for the set screw is also included.
• All Hardware Included: Kit contains the Set Screw Bolt Catch Pin (3mm), Dowel Pin for Bolt Catch (5/8″), Pistol Grip Nut (3/8″), and Pistol Grip Screw (1.5″) for immediate assembly post-milling.

Technical Specifications

• Model: Polymer80 G150 Gen2
• Material: Polymer Composite (Phoenix2)
• Color: Gray
• Included Components: AR-15 Lower Receiver G150 Gen2, J150 Jig, 7/16″ End Mill Bit, 5/16″ Drill Bit, 3/8″ Drill Bit, Set Screw Bolt Catch Pin (3mm), Dowel Pin for Bolt Catch (5/8″), Pistol Grip Nut (3/8″), Pistol Grip Screw (1.5″), 1/16″ Allen Wrench.
• Design Features: Solid core, stiffened magwell, MILSPEC buffer tube thread pattern and dimensions.

Compatibility

The G150 lower is compatible with all standard MILSPEC AR-15 upper receivers, parts kits (fire control groups, bolt catches, magazine releases, etc.), buffer tubes, and stocks/braces. It is designed for use with the included J150 jig system. This receiver will work with multi-caliber uppers chambered in 5.56/.223, .300 Blackout, 9mm, and other AR-platform cartridges when paired with the appropriate magazine and upper.

Real-World Use Cases

This kit is ideal for the experienced builder looking for a cost-effective, durable polymer lower for a lightweight hunting or training rifle. It’s perfect for a dedicated .22LR plinker build where weight savings matter, or for a truck/ranch gun where polymer’s corrosion resistance is an advantage. The complete kit format makes it an excellent choice for first-time builders who want to ensure they have every correct component from the start, avoiding tooling compatibility issues.

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 besides what’s in the kit?

You will need a drill press or a sturdy handheld drill, a vise to secure the jig, and safety equipment. The included 7/16″ end mill requires a router or a drill press with sufficient RPM and rigidity for milling. The jig does the guiding; you provide the power tools.

Is this lower compatible with AR-9 (9mm) builds?

Yes, but it requires a dedicated 9mm AR lower parts kit and a magazine block or dedicated 9mm magazine well insert (like those from Stern Defense or Mean Arms) to properly feed 9mm magazines, as the magwell is sized for standard AR-15 magazines.

How does the solid core design improve performance?

The solid core provides a more rigid platform for the fire control group pins and hammer spring tension, which can contribute to a cleaner, more consistent trigger pull and overall improved durability compared to hollow polymer receivers.

Ready to start your build? The Polymer80 G150 Kit provides the foundation, the tooling, and the confidence. Add a standard AR-15 lower parts kit and your choice of upper, and you’re in business. Order yours today and take control of your next AR project.

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.