P80 G150 AR-15 80% Receiver Kit – Black - polymer 80

About this product

The P80 G150 AR-15 80% Receiver Kit – Black is a second-generation polymer lower receiver blank that requires machining to completion. This specific model is part of Polymer80's Gen2 update featuring a proprietary polymer composite. The design focuses on structural reinforcement in critical stress areas for AR-15 platform builds.

What is the P80 G150 AR-15 80% Receiver Kit used for?

This receiver kit serves as the legal starting point for building a custom AR-15 rifle or pistol from an eighty-percent-complete state. Buyers must perform final machining operations to create the fire control group pocket before it becomes a functional firearm receiver. The process involves milling, drilling, and finishing the remaining twenty percent of the material as defined by ATF guidelines. You should read our Best Drill Bits for Polymer Frame Modifications: A Technical Guide for appropriate tooling specifications.

How does the P80 G150 compare to the .308 80% Lower – Billet?

The P80 G150 receiver kit is lighter and less expensive than the .308 80% Lower – Billet, but is compatible only with standard AR-15 components and not larger AR-10/.308 platforms. The G150 polymer construction weighs 285 grams versus approximately 510 grams for the billet aluminum alternative, offering weight reduction at the expense of material rigidity. For heavy-caliber builds, the billet receiver is structurally superior; for standard 5.56mm builds prioritizing weight, the G150 is more appropriate.

What does it weigh and what are the dimensions?

The unfinished receiver blank weighs 285 grams (10.05 ounces) and measures 213 mm in length, 76 mm in height at the buffer tube housing, and 36 mm in width at the magwell. These dimensions are within 0.5 mm of MILSPEC aluminum receiver forgings to ensure compatibility with standard upper receivers. The solid core section in the grip and buffer tower area adds approximately 15% more mass than first-generation polymer designs.

Who is this NOT for?

This kit is not suitable for builders lacking access to a drill press, milling machine, or dedicated 80% lower jig. It requires about 45-60 minutes of precise machining work to complete the fire control pocket. First-time builders without prior machining experience should consider a fully-machined lower or seek professional assistance, as incorrect milling can permanently damage the receiver beyond repair. The polymer construction also makes it unsuitable for permanent press-fit pin installations common in some specialized trigger groups.

What's in the box?

The kit contains one 80% polymer lower receiver blank, one trigger guard pre-installed, and all necessary roll pins for bolt catch and magazine release installation. No drill bits, jigs, or finishing tools are included, which differs from complete kits like the Polymer80 80% Lower Receiver and Jig Kit (LR-308). The buffer tube threads are fully formed and ready for immediate attachment of a stock or brace assembly after completion.

Is the P80 G150 AR-15 80% Receiver Kit worth it at $115?

At $115, the G150 provides a 30% cost reduction versus comparable aluminum 80% lowers while offering adequate strength for most recreational builds. The proprietary polymer composite resists cracking better than standard nylon blends, with an estimated service life exceeding 5,000 rounds in moderate-use configurations. The investment makes sense for builders prioritizing weight savings and cost over absolute durability, particularly for lightweight "pistol" builds under 5.5 lbs total weight.