Strength and versatility: Warne Maxima steel bases are today's strongest and most versatile mounting systems. The low-profile design and steel construction are significant upgrades. The Maxima one-piece steel scope base for the Thompson Center Contender uses the popular Weaver slots, one of today's strongest and most versatile mounting systems. Maxima Bases also offer a full-width recoil slot on each base. This feature allows the recoil control keys of Warne Rings to attain maximum bearing surface.