The Diamondback SDR is a double-action revolver chambered in .357 Magnum with a 2-inch barrel in a two-tone stainless and black finish. It holds 6 rounds, has a bobbed hammer, and comes with fiber optic sights. The DA/SA action is available in this compact configuration. 
 

Key Specifications 

• Brand: Diamondback 
• Model: SDR 
• Caliber: .357 Magnum 
• Action: Double Action 
• Capacity: 6 rounds 
• Barrel Length: 2 inches 
• Color/Finish: Two-Tone Stainless/Black 
   

Detailed Features 

• 2-inch barrel in two-tone stainless and black finish 
• 6-round cylinder in .357 Magnum 
• Bobbed hammer for snag-free carry 
• Fiber optic sights 
• DA/SA action

Owners who picked up the Diamondback SDR generally did so for carry purposes, and the bobbed hammer is the feature most mentioned first. It removes the snag point that full-hammer revolvers have in a pocket or holster draw, which is the point of the design. The two-tone finish is seen as a practical touch rather than purely cosmetic.

The 2-inch barrel in .357 Magnum produces significant muzzle blast, which some owners account for and others find more than they expected. A few note that .38 Special loads make the SDR much more manageable for practice while retaining the option for full-power defensive loads.

Diamondback is a smaller brand and the SDR is a newer entry in a competitive category. Some owners express confidence in fit and finish; others report needing to send the gun back for action work early in ownership. Trigger pull in double-action is described as on the heavier side, which is consistent with the bobbed-hammer snubnose category as a whole.