80% Arms is the largest manufacturer of 80% lowers and 80% lower jigs in the world. All of our products are manufactured in-house at our state-of-the art manufacturing facility encompassing over an acre in Garden Grove, CA. We are dedicated to providing the highest quality 80% lowers and jigs on the market. Sometimes when you want something done right, you have to build it yourself. That's just what we did when we designed the very first commercial router jig, revolutionizing how lowers are milled. (Easy Jig®)