The Ruger GP100 is a double/single-action revolver chambered in .357 Magnum / .38 Special, with a 4.2-inch barrel and stainless steel finish. The overall length is 9.5 inches, it holds 6 rounds, and weighs 2 lbs. 8 oz. 
 

Key Specifications 

• Model: GP100 
• Type: Revolver 
• Action: Double / Single Action 
• Caliber: .357 Magnum | .38 Special 
• Finish: Stainless Steel 
• Barrel Length: 4.2 inches 
• Overall Length: 9.5 inches 
• Capacity: 6 rounds 
• Weight: 2 lbs. 8 oz. 
• Safety Features: Transfer Bar Safety 
   

Features 

 
The frame is stainless steel throughout, which holds up well to corrosion and hard use. The black cushioned rubber grips have hardwood inserts -- comfortable for extended sessions and effective at absorbing recoil. Sights are an adjustable rear with a fiber optic front, which allows fast target acquisition across different lighting conditions. The transfer bar safety prevents the hammer from reaching the firing pin unless the trigger is fully pressed. 
 
At 2 lbs. 8 oz. the GP100 is substantial for a 4.2-inch revolver. That weight helps manage .357 Magnum recoil noticeably, which makes it more comfortable to shoot than lighter alternatives in the same caliber. 
 

Usage 

 
The GP100 handles home defense, range work, and medium-game hunting in .357 Magnum or the milder .38 Special. The double-action/single-action trigger gives flexibility: DA for fast shooting, SA for precise shots at longer distances.

The Ruger GP100 .357 Magnum in the 4.2-inch stainless configuration has a strong following, and the recurring themes in user feedback reflect that.

Build quality is the most consistent point of praise -- the stainless construction is regarded as durable and corrosion-resistant, suitable for carry in varied environments. Users frequently note that the weight, while substantial, works in the shooter's favor by dampening .357 Magnum recoil to a comfortable level.

Accuracy at mid-range gets good marks across a range of feedback, with consistent performance reported using both .357 Magnum and .38 Special loads. The trigger action and straightforward loading/unloading process are appreciated by owners who use it for self-defense or sport shooting.

The aftermarket ecosystem for the GP100 is active -- grips and sights are popular upgrades, and many owners customize those first. Stainless finish draws favorable comments from users who also appreciate the classic revolver aesthetic.

The main reservation is weight: some shooters find 2 lbs. 8 oz. heavy for extended carry, particularly those comparing it to compact polymer-frame pistols. For range use and home defense, though, that criticism rarely surfaces.

For its price bracket, the GP100 is consistently rated as high value -- build quality and accuracy that outperform similarly priced alternatives.