One of Ruger's popular affordable handguns is its SR series, and fans of the big-bore .45 ACP have invested heavily in the company's SR45. For those looking to up the number of magazines they have on-hand or replace worn-out options, Pro Mag has them covered with these Ruger SR45 Steel Magazines. Each of Pro Mag's Ruger SR45 magazines have a body constructed from heat-treated steel, which is finished with a black-oxide treatment that protects against corrosion. Inside the magazine, you'll find an injection-molded follower that tops a magazine spring made from heat-treated chrome-silicone wire. These Ruger SR45 magazines made by Pro Mag are designed for .45 ACP cartridges only and are available in 10- and 13-round capacities. All of the magazines are made right here in the USA.