AR-15 80% Lower Build Kits

These high-quality 80 lower build kits for the AR-15 will put you well on your way to building the gun of your dreams. Each kit includes the required jig and bits to machine your new lower as well as a comprehensive lower parts kit (LPK). Add an upper build kit, or piece your own kit together from some of our other categories and start building the AR-15 you've always wanted!