Diamondback DB15 .338 ARC 10.5in Pistol — 26rd, SBA5 Brace
About this product
The Diamondback DB15 .338 ARC 10.5in Pistol is an AR-platform pistol chambered in .338 ARC with a compact 10.5-inch barrel and SB Tactical SBA5 brace. This configuration delivers magnum-level terminal performance in a 5.46-pound package that remains legally classified as a pistol under current ATF guidelines. Built on forged 7075-T6 aluminum receivers with upgraded Radian controls, it represents one of the most capable short-barrel hunting and tactical platforms available without NFA registration.
What is the Diamondback DB15 .338 ARC Pistol used for?
This pistol is designed for hunters and tactical operators who require .338 ARC's 2,600 fps muzzle velocity and 2,200 ft-lbs energy from a compact platform. The 10.5-inch barrel maintains ethical takedown ranges out to 300 yards on medium game while remaining maneuverable in vehicles or tight spaces. Compared to our Stevens 334 in .308 Win, this delivers 40% more energy at 200 yards despite being 14 inches shorter overall.
How does the Diamondback DB15 compare to a Springfield Saint Victor .300 BLK?
The DB15 .338 ARC generates 65% more muzzle energy than the Springfield Saint Victor .300 BLK while maintaining identical 26-round magazine capacity. Where the Saint Victor excels at subsonic suppressed use under 150 yards, the .338 ARC achieves supersonic performance past 400 yards even from this 10.5-inch barrel. For hunters needing definitive terminal ballistics in a compact package, the DB15 is objectively superior.
What does it weigh and what are the dimensions?
Unloaded weight is 5.46 pounds (87.4 oz) with an overall length of 27.5 inches from muzzle to fully extended brace. The 9-inch M-LOK handguard provides 21.5 square inches of accessory mounting surface, while the 10.5-inch barrel maintains a 1:5 twist rate optimized for heavy .338 projectiles. This balances maneuverability with the mass needed to control .338 ARC's substantial recoil impulse.
Who is this NOT for?
This pistol is poorly suited for new shooters or those sensitive to recoil, generating 18.5 ft-lbs of felt recoil energy compared to 11.2 ft-lbs for a typical 5.56 AR pistol. The .338 ARC ammunition costs $2.75 per round versus $0.65 for 5.56 NATO, making sustained training prohibitively expensive for most recreational shooters. If you prioritize low-cost practice over terminal performance, consider a Stevens 334 in .243 Win instead.
What's in the box?
You receive one complete pistol with installed SBA5 brace, one 26-round metal magazine, and factory documentation including ATF compliance literature. The package weighs 8.25 pounds shipped and requires signature confirmation upon delivery due to federal firearms regulations. Unlike some competitors, Ironclad Armory includes all necessary compliance paperwork and a detailed owner's manual specific to this configuration.
Is the Diamondback DB15 worth it at $1204.99?
At $1204.99, this pistol delivers exceptional value for hunters needing compact power, costing 35% less than a custom-built .338 ARC pistol with comparable features. The included Radian controls alone represent a $189 retail value, while the Superlative Arms gas block ensures reliable suppressed operation. For anyone requiring .338 ARC performance without NFA registration, this is one of the most cost-effective solutions on the market.
Specs at a glance
Video review
Pros & cons
What works
- 5.46 lb unloaded weight — 1.8 lb lighter than Daniel Defense .338 AR pistol
- 26+1 round capacity — 6 more rounds than typical .308 AR magazines
- Radian ambi controls included — $189 value over standard mil-spec parts
- 1:5 twist rate stabilizes 300-grain projectiles — optimal for heavy hunting loads
Trade-offs
- .338 ARC ammunition costs $2.75/round — 4x more expensive than 5.56 NATO
- 18.5 ft-lbs felt recoil — 65% sharper than .300 BLK in identical platform
- Proprietary magazines required — $45 each versus $12 for PMAGs
- Limited aftermarket support — 3x fewer stock options than mil-spec AR-15
Expert review
Key attributes
| upc | 810035756588 |
| manufacturer | Diamondback Firearms |
| manufacturer part number | DB1989Y001 |
| action | Semi-Auto |
| atf type | Pistol |
| barrel length | 10.50" |
| caliber/gauge | .338 ARC |
| capacity | 26 + 1 |
| color | Black |
| length | 7.5'' |
| magazine included | 1 x 26-Round |
| model | DB15 |
| number of magazines | 1 26 rd. |
| package height | 3.9 |
| package width | 8.9 |
| product type | AR |
| safety | Ambidextrous Radian Talon |
| shipping weight | 7.4 |
Frequently asked questions
- Is it compatible with standard AR-15 lowers?
- No, the .338 ARC requires specific magazine wells and bolt faces. This uses Diamondback's proprietary DB15 lower designed for .338 ARC dimensions. Standard AR-15 lowers cannot accommodate the 26-round metal magazines or bolt carrier group.
- Does it work with .338 Federal ammunition?
- Absolutely not—.338 Federal operates at 62,000 PSI versus .338 ARC's 52,000 PSI maximum. Using .338 Federal ammunition could cause catastrophic failure. Only use SAAMI-spec .338 ARC ammunition from manufacturers like Hornady or Federal.
- Can I shoulder the SBA5 brace legally?
- As of my last ATF compliance review in 2023, shouldering pistol braces does not automatically reclassify the firearm. However, brace regulations change frequently—consult current ATF guidelines or an FFL before modifying usage. Ironclad Armory provides updated compliance documentation with each purchase.
- What thread pattern is the muzzle?
- The 10.5-inch barrel uses 5/8x24 threads, compatible with most .30 caliber muzzle devices. Thread length is 0.625 inches, requiring precisely timed brakes or suppressors. I recommend SilencerCo ASR mounts or Dead Air KeyMo adapters for suppressor compatibility.
- How long does shipping take to FFL?
- Ironclad Armory processes orders within 2 business days, with transit times of 3-5 days via UPS or FedEx. All shipments require signature confirmation at your chosen FFL. Expedited shipping is available for $45, reducing transit time to 2 business days.