The Smith & Wesson 617 is a double action revolver chambered in .22 LR with a 4-inch barrel and a 10-round cylinder. The finish is stainless steel throughout. One vendor lists this variant as the Mountain Gun configuration. 
 

Key Specifications 

• Brand: Smith & Wesson 
• Model: 617 
• Caliber: .22 LR 
• Action: Double Action 
• Capacity: 10 rounds 
• Barrel Length: 4 in 
• Finish: Stainless 
   

Detailed Features 

• 10-round cylinder in .22 LR 
• 4-inch barrel with stainless steel finish 
• Full-size frame suitable for range and training use 
• Stainless construction across frame and cylinder

Owners of the 617 tend to use it heavily for training and trigger development, since the .22 LR chambering makes high-volume practice affordable without the recoil of a centerfire revolver. The 10-round cylinder is a practical advantage over smaller-capacity rimfire revolvers, and most shooters find it runs reliably with quality ammunition.

Rimfire reliability is the one consistent gripe. Like most .22 revolvers, the 617 occasionally encounters light strikes or misfires with certain bulk or budget ammo. Shooters who stick to quality .22 LR brass generally report fewer issues. The stainless finish holds up well to range use and resists corrosion from the residue rimfire cartridges tend to leave.

The 617 is generally viewed as a long-term keep rather than a flip. The combination of a 4-inch barrel, 10-round capacity, and S&W build quality at a reasonable price point puts it in a useful niche. Triggers vary slightly between examples, and dry-fire practice smooths the double action pull over time.