Introduced in 1985, the Ruger GP100 double-action revolver is renowned for its durability and versatility, making it a top choice for duty, hunting, and competition use. Built on a robust frame originally designed for .44 Magnum cartridges, the GP100 is considered one of the toughest .357 Magnum revolvers available. It features a triple-locking cylinder that locks into the frame at the front, rear, and bottom, ensuring precise alignment and reliable operation. The grip frame is designed to accommodate various custom grips, enhancing comfort and control. Maintenance is straightforward with integrated subassemblies that require no special tools. The revolver employs a transfer bar mechanism, allowing safe carry with all chambers loaded by preventing the hammer from striking the firing pin unless the trigger is fully pressed. Though it lacks a manual safety, the transfer bar system offers significant security against accidental discharge. The GP100's heavy build reduces recoil, making it capable of handling powerful ammunition, suitable even for taking down a bear. It is available in multiple calibers including .357 Magnum, .327 Federal Magnum, .38 Special, 10mm Auto, .44 Special, and .22 LR, and offers various barrel lengths, finishes, grips, and capacities, solidifying its reputation as a versatile and reliable revolver.