The Modulus Arms Ultimate Builder's Kit includes everything needed to get into 80 percent AR-15 and AR-308 rifles. Each of our Universal Jigs are included in the package, with which multiple lowers can be completed. For starters, we include a forged AR-15 and a billet AR-308 black anodized 80% lower. Our Jig Tool Kit, which has been designed to work with both jigs, rounds the package out for the most complete 80% lower receiver kit available.
Modulus Arms jigs employ the finest engineering features and router based milling, yielding finished lower receiver quality that is unrivaled on the market today. The Ultimate Builder's kit is a tremendous value, and far less expensive than purchasing each of the products separately. Click here for more details.