The Ruger GP100 is a double/single-action revolver chambered in .357 Magnum and .38 Special. This configuration has a 4.2-inch barrel, high-polish stainless steel finish, and weighs 40 ounces. It holds 6 rounds and ships with a fully adjustable rear sight and gold bead front sight. 
 

Key Specifications 

• Model: Ruger GP100 
• Caliber: .357 Magnum / .38 Special 
• Barrel Length: 4.2 inches 
• Capacity: 6 rounds 
• Weight: 40 ounces (2.5 pounds) 
• Finish: High-color stainless steel 
• Action Type: Single/Double Action 
• Sights: 
  • Front Sight: Gold Bead 
  • Rear Sight: Fully Adjustable 
     

Features 

The GP100 is built on a medium/heavy frame that handles full-power .357 Magnum loads without drama. The transfer bar safety prevents the hammer from contacting the firing pin unless the trigger is pulled, which is useful for a carry revolver. The adjustable rear sight paired with the gold bead front works well for target shooting and gives enough precision to dial in point of impact for your preferred load. 
 
The hardwood checkered grips give good purchase and help manage recoil. For maintenance, the GP100 breaks down into large subassemblies without tools, which makes cleaning straightforward. The stainless finish holds up to outdoor use and sweat better than most blued finishes. Accepting both .38 Special and .357 Magnum makes ammunition selection flexible. You can practice cheaply with .38 and carry .357.

The GP100 has a well-earned reputation for durability. Owners regularly note that it handles sustained .357 Magnum shooting better than most revolvers its size, and the 40-ounce weight absorbs recoil enough that it is comfortable to shoot for extended range sessions.

The adjustable sights get consistent praise for accuracy. Most owners find they can dial in a specific load and hold tight groups at typical handgun distances. The double-action trigger pull is on the heavier side out of the box, which some shooters feel affects accuracy under time pressure, though it often smooths out with dry-fire practice.

Ergonomics are generally well-received. The grip fits a wide range of hand sizes and the controls are easy to reach. Cleaning is simple, which owners appreciate compared to semi-automatic pistols.

Price is occasionally a discussion point. Some buyers compare it against other .357 revolvers at lower price points. The counterargument from most long-term owners is that the GP100 tends to outlast them, so the initial cost becomes less of a factor over time. The ability to shoot .38 Special is a practical bonus for keeping training costs down.