Description John Browningâs iconic masterpiece meets perfectionist Swiss craftsmanship in a rugged, combat-ready package with Sig Sauerâs line of 1911 pistols. Constructing from surgical grade stainless steel, with wide witness cuts, thick music wire springs and polymer baseplate, Sigâs 1911 magazines are designed to function and feed reliably even in the harshest conditions, and built to Sigâs exacting specifications. These magazines are compatible with Sig 1911 pistols chambered in 9mm