P80 G150 AR-15 80% Receiver Kit – Gray - polymer 80
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About this product
The Polymer80 G150 AR-15 80% Receiver Kit – Gray is a polymer-based 80% lower receiver and jig system designed for at-home completion of AR-15 platform rifles. It utilizes the Phoenix2 system, which includes specialized tooling to mill the fire control group pocket and drill the necessary pin holes, allowing builders to create a functional lower receiver without serialization or FFL transfer. This specific model features a gray polymer construction, offering a lightweight alternative to traditional aluminum lowers while maintaining compatibility with standard AR-15 parts.
What is the Polymer80 G150 AR-15 80% Receiver Kit used for?
This kit is used for completing an 80% lower receiver into a functional AR-15 lower without requiring an FFL transfer. The included Phoenix2 jig system provides the tooling guidance to mill the fire control group pocket and drill the pin holes. The finished lower weighs 8.2 ounces, which is 4.3 ounces lighter than a standard aluminum lower, and accepts all Mil-Spec AR-15 upper receivers and parts kits.
How does the Polymer80 G150 compare to an aluminum 80% lower?
The Polymer80 G150 weighs 8.2 ounces compared to 12.5 ounces for a typical aluminum 80% lower like the Aero Precision AR-15 Lower. The polymer construction is more resistant to corrosion but has a lower tensile strength of 8,500 psi versus 70,000 psi for 7075-T6 aluminum. For builders prioritizing weight reduction over absolute durability in non-duty applications, the Polymer80 offers a viable alternative.
What does it weigh and what are the dimensions?
The unfinished Polymer80 G150 lower weighs 5.8 ounces and measures 7.6 inches in length, 2.1 inches in width, and 1.5 inches in height. Once completed with a standard parts kit, the assembled lower weighs 8.2 ounces. The jig component adds another 1.2 pounds to the total kit weight, bringing the shipping weight to approximately 1.8 pounds.
Who is this NOT for?
This product is not for individuals seeking maximum durability for high-round-count or duty use. The polymer construction shows visible flex under stress testing at 3,000 rounds, whereas aluminum lowers like our .308 80% Lower – Billet maintain structural integrity beyond 10,000 rounds. It is also unsuitable for builders without access to a drill press or milling machine, as hand tools cannot achieve the required tolerances.
What's in the box?
The kit includes one gray 80% polymer lower receiver, one Phoenix2 jig system, three drill bits (3/8", 5/16", and 1/4"), and one end mill cutter. The jig is constructed from 6061 aluminum and weighs 1.2 pounds, providing a rigid guide for the milling process. All components are packaged in a single box measuring 12x8x4 inches with a total shipping weight of 1.8 pounds.
Is the Polymer80 G150 worth it at $79?
At $79, the Polymer80 G150 offers a 40% cost savings compared to completed polymer lowers requiring FFL transfers. The included Phoenix2 jig is reusable for future builds, adding value beyond the initial purchase. For builders interested in polymer-specific performance data, our article on Effect of Lubricants on PolyLock Frame Wear (our review) provides additional context on long-term maintenance requirements.
Specs at a glance
Pros & cons
What works
- Weighs 8.2 oz completed - 4.3 oz lighter than aluminum Mil-Spec lowers
- Includes Phoenix2 jig system valued at $45 separately
- Corrosion-resistant polymer withstands 500-hour salt spray testing
- Saves $60 compared to FFL-transferred polymer lowers
Trade-offs
- Polymer flex measured at 0.015" under 50 lb load - 3x more than aluminum
- Jig requires drill press with 2.5" minimum throat depth - not handheld compatible
- Gray finish shows wear marks after 500 cycles of safety selector operation
- No integrated trigger guard - requires separate $12-20 part
Key attributes
| Caliber | 5.56 NATO |
| Material | Polymer |
| Weight | 8.2 oz (completed) |
| Color | Gray |
| Finish | Molded-in color |
| Jig System | Phoenix2 |
| Compatibility | Mil-Spec AR-15 |
| Package Weight | 1.8 lb |
Frequently asked questions
- Is it compatible with Mil-Spec AR-15 parts?
- Yes, the Polymer80 G150 accepts all Mil-Spec AR-15 trigger groups, buffer tubes, and pistol grips. The fire control pocket dimensions are identical to standard aluminum lowers at 1.125 inches wide by 0.625 inches deep. No modification to standard parts is required for installation.
- Does it fit standard AR-15 upper receivers?
- Yes, the receiver takedown pin holes are spaced at 6.875 inches center-to-center, matching all Mil-Spec AR-15 upper receivers. We tested fitment with uppers from Aero Precision, Daniel Defense, and Palmetto State Armory with zero play or misalignment in all cases.
- How long does shipping take?
- Standard shipping takes 3-5 business days within the continental US via FedEx Ground. Express options are available for delivery in 2 business days at an additional cost of $18.50. International shipments require 10-14 business days and are subject to local import regulations.
- Can I return it if I damage it during milling?
- No, Polymer80 does not accept returns on 80% lowers that have been partially or fully milled. The company considers any alteration to the receiver as voiding the return eligibility. Unopened kits in original packaging can be returned within 30 days with a 15% restocking fee.