To make your 80% receiver into a proper AR-15 lower, you'll need an AR15 jig, like the ones listed here. The AR 15 jig replicates the same milling and drilling procedures a commercial arms maker uses to fabricate an AR-15 stripped lower receiver.

Modulus Arms is proudly known as the best 80 percent lower and 80% lower jig manufacturer on the market. Come check out our selection of American-made 80 lowers today! All of our products ship FAST.

5D Tactical AR-15 and AR-10/AR-308 router jigs are the only 80% lower jigs that have been specifically optimized for use with a handheld router. Our engineering experts have identified weak points with other router jigs and now offer you a …

The patented Easy Jig® Gen 3 Multiplatform™ replaces the Gen 2 as the world's easiest to use, fully universal, 80% lower jig capable of finishing AR-15, AR-9, AR-45 and DPMS gen 1 pattern .308 80% lower receivers without the need for any additional adapter pieces.

Build an AR-15, AR-10, 1911, Sig P320, or Glock®-compatible handgun with your own tools and know-how? Then you need an 80% lower jig. This is the tool you'll use to machine your AR's receiver blank or your new handgun's 80% frame.

Craft premium AR-10/AR-15 lowers with our Ultimate Jig. Comes with alignment tool, steel bushings, depth gauge, and optional tooling. Made in the USA.

We stock AR15 lower jigs from models like our Easy Jig to our Universal Drill Press. See what AR15 jigs we have for your 80% lower build right here!

Elevate your AR-15 lower receiver completion with our premium 80% Lower JIG AR 15. Crafted from durable 6061-T6 Aluminum, this kit includes right and left side plates, along with three interchangeable top plates and screws.

The fast, accurate, bombproof 80% Lower Jig from Elite Builder now ships with equally high-quality drill bits and end mill bits. This gunsmithing combo kit allows you to confidently cut and drill multiple AR-15 and AR-9 80% lower receivers without losing speed or accuracy.