Diamondback SDR 9mm: A Modern Take on the Classic Revolver

May 3, 2026

Overview

The Diamondback Firearms SDR (Self Defense Revolver) is a modern, American-made double-action revolver, initially launched in .357 Mag/ .38 Spl and now available in 9mm. This six-shot revolver is aimed at those seeking a compact, reliable, and potentially versatile self-defense option, and offers a unique approach to cylinder swapping for future caliber conversions.

Specs at a Glance

Caliber: 9mm
Action: Double-Action/Single-Action
Barrel Length: 2 inches
Capacity: 6 rounds
Weight: 21.2 ounces (unloaded)
MSRP: Not yet published

Features and What Sets It Apart

The Diamondback SDR distinguishes itself from many subcompact revolvers with its upgraded sighting system and innovative cylinder release mechanism. While drawing design cues from models like the Kimber K6s, it’s 1.8 ounces lighter. The inclusion of removable steel low-profile sights, featuring fiber-optic inserts, is a significant upgrade often absent in this class of firearm. The barrel boasts a 45-degree crown and a full underlug, housing a knurled ejector rod. The cylinder itself features weight-reducing fluting and chamfered chamber mouths for easier reloading, and is notably narrower than many six-shot revolvers, comparable to five-shot models.

However, the most unique feature is the spring-loaded release button on the right side of the frame, replacing the traditional cylinder yoke screw. This allows the entire cylinder assembly to slide forward for easy removal – a design typically reserved for caliber-convertible revolvers. Diamondback has indicated this is intentional, hinting at future availability of additional cylinders to allow the SDR to fire .38 Spl, .38 Spl +P, and .357 Mag alongside 9mm and 9mm +P. This potential for caliber conversion, coupled with the readily available and affordable 9mm ammunition, makes the SDR a compelling option.

Ergonomics and Handling

Diamondback clearly considered shootability when designing the SDR. The trigger, described as match-grade, delivers a smooth, even double-action pull measuring 9 pounds, 9 ounces. Switching to single-action mode via the serrated hammer spur (sized appropriately for concealed carry) reduces the pull weight to a light 3 pounds, 2 ounces. The grip frame is shaped to accept common Smith & Wesson J-frame grips, offering customization options. The included grip is a pebbled, soft rubber boot grip with finger grooves, providing a comfortable and secure hold. The push-button cylinder release, wedge-shaped and larger than many competitors, is intuitive and easy to operate. The overall feel suggests a well-balanced and thoughtfully designed revolver, prioritizing both comfort and functionality. If you’re looking for a quality revolver, consider visiting your local gun store like BT Gun Company, a trusted FFL dealer, to handle one yourself.

Pros and Cons

Pros:
Innovative cylinder release for easy cleaning and potential caliber conversions
Upgraded fiber-optic sights
Comfortable trigger pull (both DA/SA)
Accepts common Smith & Wesson J-frame grips
9mm chambering offers cost savings and ammo commonality

Cons:
Requires moon clips for 9mm reloading
MSRP not yet published
Caliber conversion cylinders not currently available

Final Verdict: Is It Worth Buying?

The Diamondback SDR 9mm is a promising addition to the revolver market. Its combination of modern features, comfortable ergonomics, and the potential for future caliber conversions make it a standout option. While the need for moon clips might be a drawback for some, the benefits of 9mm affordability and availability are significant. This revolver is an excellent choice for those seeking a compact, reliable, and potentially versatile self-defense handgun, especially if you already shoot 9mm pistols or PCCs. However, if you strongly prefer traditional revolver designs or are unwilling to use moon clips, other options might be a better fit. As a reputable firearms dealer, BT Gun Company can help you determine if the Diamondback SDR is the right choice for your needs.

Ready to order? Check current availability at BT Gun Company and see if the Diamondback SDR is in stock today!