P80 G150 AR-15 80% Receiver Kit – Black
Pros & cons
What works
- Forged 7075-T6 aluminum construction – superior fatigue strength vs. 6061 billet for long-term reliability.
- Includes proprietary Easy Jig Gen 3 – eliminates guesswork in alignment, critical for safe fire control pocket depth.
- Complete tool package – provides the exact 5/16" end mill and three drill bits required, no secondary purchases needed.
- Precision dimensional tolerance (+/- 0.005") – guarantees fit with any Mil-Spec upper without post-machining fitting.
Trade-offs
- Requires user-supplied drill press/router – adds a minimum $150 equipment cost for those without workshop access.
- No lower parts kit included – you must separately source pins, trigger, hammer, and buffer assembly to complete a functional lower.
- Jig is single-use for one receiver – after milling, the alignment holes are compromised; a new jig is needed for subsequent builds.
Video review
Expert review
Specs at a glance
About this product
The P80 G150 AR-15 80% Receiver Kit in Black is a complete, single-forged aluminum 80% lower receiver kit that includes the proprietary Easy Jig Gen 3 and all tooling required for legal user completion. This package consolidates sourcing, ensuring compatibility and saving builders hours of research and vendor vetting. It represents the most streamlined entry point for enthusiasts who demand metallurgical integrity and a jig system proven under professional pressure.
What is the P80 G150 80% Receiver Kit used for?
It's used to legally manufacture a functional AR-15 lower receiver, turning an unfinished forging into a serialized, fire-control-ready component. The kit provides every necessary element—the 80% forging, precision jig, and cutting tools—removing guesswork from the process. This is ideal for builders who want control over their lower's completion without sourcing a disparate collection of parts and specialized fixtures, ensuring the final assembly meets their personal standards for fit and function.
How does the P80 G150 compare to the .308 80% Lower – Billet?
The P80 G150 is for standard AR-15 builds in 5.56/.223, while the .308 80% Lower - Billet is for the larger AR-10/LR-308 platform and uses a different machining process. The G150's forged construction prioritizes fatigue strength and cost-efficiency for high-volume 5.56 applications, weighing in at a precise 9.8 ounces before machining. The .308 billet offers greater dimensional customization for heavy-caliber builds but requires more aggressive milling and a 20% higher per-unit material cost. For a standard AR-15 platform, the G150's forged strength is the superior, battle-proven choice.
What does it weigh and what are the dimensions?
The unfinished 80% lower forging measures 7.75 inches in length, 2.25 inches in width at its broadest point, and has a critical fire control pocket depth of 1.125 inches. The raw forging weighs 9.8 ounces (278 grams), which will reduce to approximately 8.5 ounces after the final milling operations are complete. These dimensions are held to a tight +/- 0.005-inch tolerance, ensuring they will mate precisely with any Mil-Spec upper receiver without requiring additional fitting or shimming.
Who is this NOT for?
This kit is not for someone unwilling to operate a drill press or router for a minimum of 45-60 minutes of precise machining. It requires a basic competence with hand tools and the patience to follow technical instructions, like those in our guide on jig alignment. If you want a finished, serialized lower ready for immediate parts installation, purchase a completed lower receiver. This kit is for the builder who sees the process as part of the ownership experience and demands provenance over their firearm's critical component.
What's in the box?
The box contains one 7075-T6 aluminum 80% lower forging, one Easy Jig Gen 3 fixture, one 5/16" diameter carbide end mill, three drill bits (3/8", 5/16", and 1/4"), all necessary jig screws and alignment pins, and a comprehensive step-by-step drill template. Unlike competing kits that omit tooling, this is a true turn-key solution; you supply the drill press or router, a vise, and cutting fluid. Nothing else needs to be sourced, which eliminates compatibility errors that can ruin a $150 forging in seconds.
Is the P80 G150 worth it at $0.0?
A price of $0.0 is typically a placeholder, and value must be assessed against the market cost of purchasing a quality forged 80% lower, a precision jig like the Easy Jig Gen 3, and the proper tooling separately. Bundled, these items often retail for over $250. If the final price is competitive with that bundle, it's worth it for the guaranteed compatibility and saved logistical hassle. If the price is significantly higher, you're paying a premium for single-vendor convenience, which may only be justified if your time sourcing parts is more valuable than the cost differential.
Key attributes
| Material | Forged 7075-T6 Aluminum |
| Finish | Black Anodized |
| Platform | AR-15 / Multi-Caliber |
| Compatibility | Mil-Spec AR-15 Upper Receivers |
| Jig System | Easy Jig Gen 3 |
| Raw Weight | 9.8 oz (278 g) |
| Length | 7.75 in |
| Includes Tooling | Yes (End Mill, Drill Bits) |
Best for
- AR-15 building
- custom firearm assembly
- home gunsmithing
Materials
- forged aluminum
What's in the box
- 80% lower receiver
- Easy Jig Gen 3
- tooling
Care
Frequently asked questions
- Is it compatible with all Mil-Spec AR-15 upper receivers?
- Yes, the finished receiver is dimensionally identical to a Mil-Spec AR-15 lower. Its 7.75-inch length and pin locations are held to a 0.005-inch tolerance, ensuring drop-in compatibility with any standard upper receiver from brands like Aero Precision, BCM, or Colt without modification.
- Does the included jig work with other 80% lowers?
- No, the Easy Jig Gen 3 is specifically engineered and pinned for Polymer80's own G150 forgings. Attempting to use it with a different brand's 80% lower, like an Anderson or an 80% Arms model, will result in misaligned cuts and a ruined part. Always use the jig with its matched receiver.
- What tool do I need to supply myself?
- You must provide a drill press or a router with at least 1/2 HP and a secure vise. A router is preferred for the fire control pocket; a standard 10-12 amp model from DeWalt or Makita works perfectly. You will also need cutting fluid or oil; do not attempt to mill aluminum dry.
- How long does the machining process take?
- For a first-time user following instructions carefully, plan for 60 to 90 minutes of active machining time. This includes setup, three drilling operations, and the end mill routing. Rushing is the primary cause of errors; take your time, especially during the 5/16" pilot hole drill and the final 3/8" trigger pin hole.