The Ruger SP101 is a double-action revolver derived from the popular GP100 platform. It features a triple-locking cylinder—an attribute of guns intended for higher pressure cartridges—a transfer bar safety mechanism and a firing pin mounted within the frame. What makes this particular revolver so unique is its chambering—.327 Fed. Mag. Unlike its .357 Mag. counterparts, a .32-cal. bore and cylinder allowed Ruger to squeeze an additional round into the gun, raising its capacity to six rounds. Additionally, its chambering makes this gun capable of firing a handful of other cartridge types. Watch this week's "NRA Gun of the Week" video to learn more about that special feature and much more.