The Federation Firearms SA-4 is a 12 gauge, 3" semi-automatic shotgun with a Burnt Bronze finish, offering a dual-piston gas system, an adjustable synthetic stock, and 3 included chokes. The Burnt Bronze finish is a brown-bronze with a soft gold metallic flake, Prismatic Powders states. It has a 18.7" barrel and is designed for home defense and sporting applications.