The Diamondback SDR is a DA/SA revolver chambered in .357 Mag that also accepts .38 Special +P. It has a 3-inch barrel with a glass bead stainless steel finish and holds 6 rounds. Sights are a fiber optic front paired with a fiber optic rear, and the grips are rubber. 
 

Key Specifications 

• Brand: Diamondback Firearms 
• Model: SDR 
• Caliber: .357 Mag / .38 Special +P 
• Action: Double Action / Single Action 
• Barrel Length: 3 in 
• Capacity: 6 rounds 
• Color/Finish: Glass Bead Stainless 
   

Detailed Features 

• DA/SA trigger mechanism 
• 3-inch barrel 
• Fiber optic front and rear sights 
• Glass bead stainless steel finish 
• Rubber grips

Owners of the Diamondback SDR tend to approach it as an entry-level stainless revolver in a competitive price bracket. The fiber optic sights are a genuine differentiator at this price point and get consistent positive mention, particularly for low-light visibility.

The DA/SA trigger is functional but splits opinion. Single-action pull is acceptable; double-action is heavier than most carry-oriented users prefer and requires deliberate practice to shoot accurately. The 3-inch barrel sits between compact snub-nose and full-size service revolvers, which some see as a versatile middle ground and others see as a compromise.

The glass bead stainless finish is attractive out of the box, though a few long-term owners note it shows holster wear faster than a polished or matte equivalent. Rubber grips absorb recoil well with .357 Mag loads, which is a common compliment, but some find them tacky in warm weather.