The Diamondback SDR is a double-action/single-action revolver chambered in .357 Mag that also accepts .38 Special +P. It has a 2-inch barrel and a 6-round cylinder. The finish is Black Nitride with a Blue/Black appearance, and it comes with Hogue Black Rubber grips and fiber optic sights. 
 

Key Specifications 

• Brand: Diamondback 
• Model: SDR 
• Caliber: .357 Mag / .38 Special +P 
• Action: Double Action 
• Capacity: 6 rounds 
• Barrel Length: 2 inches 
• Color/Finish: Blue/Black, Black Nitride 
   

Detailed Features 

• DA/SA action 
• 2-inch barrel 
• Hogue Black Rubber grip with Diamondback logo 
• Fiber optic sights 
• Black Nitride finish

The Diamondback SDR fills a role as a compact snub-nose revolver that accepts both .357 Mag and .38 Special +P, giving owners flexibility in ammunition selection. The 2-inch barrel keeps it compact for carry, and the Hogue rubber grip is frequently noted as an upgrade over bare checkered grips in managing recoil with full-power .357 loads.

Fiber optic sights on a 2-inch revolver draw mixed commentary. Some owners appreciate the improved sight picture for daytime use, while others find it unnecessary on a close-range defensive platform and worry about durability. The Blue/Black finish with Black Nitride has a good reputation for corrosion resistance.

As a newer entrant from Diamondback in the revolver segment, the SDR generates curiosity. Owners report generally positive reliability, though the brand's revolver track record is shorter than established competitors, making some buyers cautious. Value and the included Hogue grips are commonly cited as reasons to give it a try.