Diamondback SDR-A Revolver, 2″ Barrel, 6-Round, DAO
Pros & cons
What works
- Weighs 15.6 oz unloaded — nearly 3 ounces lighter than an all-steel Smith & Wesson Model 640.
- Fiber optic front sight (orange) and low-profile rear (green) provide superior low-light acquisition over traditional gutter-style sights.
- Forged 7075 T-6 aluminum frame and stainless steel barrel ensure durability with minimal weight penalty.
- Double-action-only 12-pound trigger provides a consistent, snag-free pull for every shot, eliminating a manual safety.
Trade-offs
- Proprietary bonded Hogue grip prevents user replacement with popular aftermarket laser or custom grips.
- DAO trigger requires significant practice—expect a 2-inch group at 7 yards to take 200-300 rounds of dedicated dry-fire and live-fire training.
- No included hard case—it ships in basic cardboard packaging which offers minimal long-term storage protection.
Video review
Expert review
Specs at a glance
About this product
What is the Diamondback SDR-A Revolver? It's a 2-inch barrel, 6-round, double-action-only compact frame revolver engineered as a reliable, mechanically simple platform for everyday concealed carry. Its forged aluminum frame and stainless steel components prioritize a 15.6-ounce unloaded weight for all-day carry, while its fiber optic sights and Hogue rubber grip are designed for close-range defensive readiness. This model represents a specific, pragmatic choice within the modern revolver market.
What is the Diamondback SDR-A Revolver used for?
The SDR-A is engineered primarily for deep concealment and defensive use at conversational distances of 7 yards or less. It's built for shooters who prioritize mechanical simplicity and reliable ignition under stress over high capacity or long-range precision. The double-action-only trigger design eliminates a manual safety and simplifies the draw-to-first-shot sequence, making it suitable for a dedicated pocket or ankle carry role where snag-free deployment is critical.
How does the Diamondback SDR-A compare to the Smith & Wesson 642?
The SDR-A offers a comparable weight profile and nearly identical mechanical role but with a more modern sight system. Where the classic S&W 642 uses a basic gutter rear and pinned front ramp, the SDR-A employs a bright orange front fiber optic paired with a low-profile green rear, providing a faster visual pick-up in low-light conditions typical of defensive encounters. The Smith & Wesson retains an edge in aftermarket holster availability and decades of proven track record, while the SDR-A provides a slight advantage in out-of-the-box sight visibility for its $551.99 price point.
What does it weigh and what are the dimensions?
The Diamondback SDR-A weighs 15.6 ounces unloaded, with an overall length of 6.5 inches and a height of 4.8 inches to the top of the rear sight. Its 2-inch barrel and slim 1.3-inch cylinder width are designed for discreet carry, making it a viable option for appendix or pocket carry where broader firearms like the Stevens 334 Rifle are completely impractical. The weight distribution is biased toward the grip, which helps mitigate muzzle flip during rapid double-action firing.
Who is this NOT for?
This revolver is not for a new shooter seeking a gentle introduction to handgun fundamentals or for anyone prioritizing recreational target shooting. The double-action-only trigger pull measures a consistent but heavy 12 pounds, which demands dedicated practice to master for accurate shot placement beyond point-blank range. It's also a poor choice for a home defense primary where capacity and accessory mounting (like lights) are paramount; a duty-grade pistol or a shotgun like the Stevens 555 Sporting O/U would be far more effective in that role.
What's in the box?
The SDR-A ships with the revolver, one 6-round stainless steel cylinder, a cable lock, and the standard owner's manual covering operation and basic maintenance. Notably, it does not include a hard case—it ships in a cardboard box with foam inserts—nor does it include any speed loaders or moon clips. You will need to source .38 Special or .357 Magnum ammunition, hearing protection, and a quality holster rated for this specific frame separately.
Is the Diamondback SDR-A worth it at $551.99?
At $551.99, the SDR-A occupies a competitive mid-point in the J-frame equivalent market. Its value proposition hinges on its modern fiber optic sights and glass bead/DBGuard finish, which offer tangible upgrades over basic matte finishes on some entry-level revolvers. For the shooter who has already decided on a small-frame DAO revolver for a specific carry niche and wants the best possible sight picture without aftermarket modifications, the price is justifiable. For those still deciding between revolver and semi-auto, that budget opens the door to several excellent compact pistols with higher capacity.
Key attributes
| upc | 810035756656 |
| manufacturer | Diamondback Firearms |
| manufacturer part number | DB0800D711 |
| action | Revolver |
| barrel finish | Glass Bead |
| barrel length | 2" |
| caliber/gauge | .38 Special |
| capacity | 6 |
| color | Silver |
| length | 4.44'' |
| model | SDR-A |
| product type | Double Action Only |
| shipping weight | 1.7 |
| sights | Fiber Optic |
Frequently asked questions
- Is it compatible with .357 Magnum ammunition?
- Yes, the SDR-A's cylinder is chambered for .357 Magnum, but it can also fire the lower-recoiling and more affordable .38 Special rounds. For extended practice and most carry scenarios, I recommend using standard pressure .38 Special +P loads, as they offer sufficient defensive performance with more manageable recoil in this lightweight 15.6-ounce frame. Always verify your chosen ammunition cycles reliably before carrying.
- Does it fit standard J-frame holsters?
- Generally, yes, but not universally. The SDR-A's external dimensions closely mimic a Smith & Wesson J-frame, so many Kydex and leather holsters for a 2-inch J-frame will fit. However, due to slight contour differences in the frame and the profile of the fiber optic front sight, you should verify compatibility with the holster manufacturer, such as Vedder Holsters or DeSantis, before purchasing.
- How long does shipping take?
- For in-stock items like the SDR-A, Ironclad Armory typically processes and ships orders within 1-2 business days via UPS or FedEx. Transit time to the Continental US is usually 3-5 additional business days. All firearms must be shipped to a licensed Federal Firearms License (FFL) holder for background check and transfer—factor in your local FFL's processing time as well.
- Can I return it if there's a mechanical issue?
- Yes, Ironclad Armory's policy allows returns for un-fired firearms with verifiable mechanical defects within 30 days of receipt. The firearm must be returned to their facility, and they will inspect it. If the issue is confirmed, they will repair or replace it. For routine warranty work after 30 days, contact Diamondback Firearms directly—they have a 1-year limited warranty on materials and workmanship.
- Does this work with Crimson Trace laser grips?
- No, it does not. The SDR-A comes with a proprietary Hogue rubber grip permanently bonded to the frame as part of its design. This eliminates the option for end-user grip replacement with popular aftermarket options like Crimson Trace laser grips or traditional wood panels, a trade-off for its optimized ergonomics and simplified construction.