The Anderson Manufacturing AM 80% Jig Kit Gen 2 is a complete machining solution for builders who want to finish an 80% lower receiver at home. This is the tooling that separates guesswork from precision—every component you need to accurately drill and mill your lower comes in one box. Whether you're a first-timer or an experienced gunsmith, this jig kit removes the trial-and-error that can turn a project into scrap metal.
Building an 80% lower requires accuracy measured in thousandths of an inch, and the AM Gen 2 jig handles that job. The kit includes dual fixture plates and a drill plate that clamp securely to your workpiece, ensuring every hole and pocket lands exactly where it needs to. A complete set of drill bits—1/8", 5/32", 5/16", and 3/8"—covers the primary operations, and the 1/4" flat end mill handles pocket work for the fire control group and magazine well. All fasteners (socket head cap screws and pins) are included, so you're not hunting through your toolbox before you start.
Two precision templates guide your layout and drilling sequence, taking the guesswork out of hole placement and depth. Anderson includes printed instructions or a documentation link in the box, so you have clear steps from start to finish. This is purpose-built for patience and accuracy—not speed. If you're serious about building lowers yourself and want a system that works, the AM 80% Jig Kit Gen 2 delivers the repeatability and control that separates finished receivers from learning-curve scrap.
The kit provides all cutting tools and fasteners. You'll need access to a drill press or milling machine to hold the jig and cut the receiver. A vise to hold the jig assembly is also standard shop equipment required for the work.
The AM jig kit is designed for Anderson Manufacturing 80% lowers. Compatibility with other manufacturers' receivers is not specified in the kit details, so verify fitment before purchasing if you're working with a different brand.
This is the Gen 2 version of the Anderson Manufacturing 80% Jig Kit, representing the second generation of the tool design.
Wheeler
Weaver
