Description
Most small-frame magnum revolvers make you settle for five rounds. The Diamondback SDR gives you six, and it does it in a package that feels just like a classic J-frame in the hand. This version pairs a 3-inch barrel with a glass bead stainless finish, and that extra inch over the standard snub buys you a longer sight radius, a bit more velocity, and noticeably better manners under recoil, all while staying plenty compact for a belt holster. Chambered for .357 Magnum, it happily digests .38 Special and +P loads too, so you can train soft and carry stout.
The Trigger That Put the SDR on the Map
Ask anyone who has run one of these and the trigger comes up first. The double-action pull is smooth and non-stacking from start to finish, running in the 9 to 11.5 pound range, and thumbing back the exposed hammer gets you a crisp single-action break around 3.5 pounds. Pinned up top is an orange fiber optic front sight paired with a low-profile dovetailed rear flanked by green fiber optic rods, giving you a fast, high-contrast sight picture that beats the trench-style sights on most defensive revolvers.
Built Smart, Built in the USA
Diamondback machines the SDR from forged stainless steel at their Florida facility, and the details show real thought. A serrated push-button cylinder release sits right where your thumb wants it, and pressing a second button on the frame lets the entire cylinder and crane assembly lift out as one unit for easy cleaning. The chambers are chamfered for smoother reloads, and a 45-degree target crown protects the rifling at the muzzle.
Living With the SDR
The factory Hogue rubber grips soak up recoil nicely, and since the grip frame follows the J-frame pattern, swapping to your favorite aftermarket stocks is simple. It also runs with common speedloaders sized for six-shot small frames, and holster options are easy to come by. For everyday carry, home defense, or just a fun day punching paper, this one earns its spot.
Key Specifications
- Manufacturer: Diamondback Firearms
- Model: SDR (Self Defense Revolver)
- Manufacturer Part Number: DB0700S713
- UPC: 810035756670
- Caliber: .357 Magnum / .38 Special +P
- Action: Double Action / Single Action
- Capacity: 6 Rounds
- Barrel Length: 3"
- Finish: Glass Bead Stainless Steel
- Frame Material: Forged Stainless Steel
- Front Sight: Fixed Orange Fiber Optic
- Rear Sight: Low-Profile Dovetail Green Fiber Optic
- Grips: Hogue Black Rubber with Diamondback Logo
- Trigger Pull: 9-11.5 lbs DA / approx. 3.5 lbs SA
- Twist Rate: 1:18.75"
- Weight: 23.9 oz
What’s Included
- Diamondback SDR revolver
- Zippered soft pistol case
- Cable lock
- Owner's manual
Frequently Asked Questions
Can the Diamondback SDR shoot .38 Special ammo?
Yes. The SDR is chambered in .357 Magnum, which means it also safely fires .38 Special and .38 Special +P loads. A lot of owners practice with milder .38s to keep range sessions comfortable, then load hotter defensive rounds for carry.
Will J-frame grips and speedloaders work with the SDR?
The grip frame follows the S&W J-frame pattern, so standard J-frame stocks fit if you want to swap out the factory Hogue rubber grips. For reloads, speedloaders made for six-shot small frames like the Kimber K6s work, including options from HKS, 5 Star, and Speed Beez, and flat speed strips are always a solid pocket-friendly choice.
What does the extra button on the frame do?
That's the cylinder removal button, one of the SDR's signature features. With the cylinder swung open, pressing it lets you lift the entire cylinder and crane assembly out as one contained unit. It makes deep cleaning much easier than on most revolvers, and the trigger and hammer lock up when the cylinder is out.
Why pick the 3-inch SDR over the 2-inch version?
The 3-inch barrel gives you a longer sight radius for more precise aiming, a little extra velocity from the same ammo, and slightly better recoil control thanks to the added weight up front. It's still compact enough for belt carry, so it's a great fit if you want one revolver that pulls double duty for carry and range time.




Reviews
There are no reviews yet.