Description
Charter Arms took two of its most popular wheelguns, the .357 Magnum Mag Pug and the 9mm Pit Bull, and rolled them into one package called the Double Dog. This model 13920 ships with both cylinders, and swapping between them takes about a minute with nothing more than the crane screw on the front of the frame. That means one revolver covers .357 Magnum, .38 Special, and 9mm, which is handy when ammo prices swing or when you want cheap 9mm practice with the same gun you carry loaded with magnums.
Why the Double Dog's 9mm Cylinder Stands Out
Most 9mm revolvers make you fuss with moon clips. Charter's patented extraction system uses spring-loaded studs in the extractor star that grab each case at the extraction groove, so rimless 9mm rounds load and eject like rimmed cartridges. Both cylinders have their calibers laser engraved right on them, so there's never any question about which one is in the gun, and Charter tosses in extra crane screw washers to keep swaps worry free down the road.
A Mag Pug Built for the Belt
The 2.2 inch barrel is ported on both sides of the rib to tame muzzle flip, with diamond cuts machined into the full underlug for a bit of style and weight savings. The frame, barrel, and cylinders are stainless steel dressed in a matte black passivate finish, and checkered walnut boot grips fill the hand without printing under a cover garment. At around 22 ounces with a five round capacity, fixed sights, and a traditional double action/single action trigger with exposed hammer, it carries like a classic snubbie should. A transfer bar keeps the firing system inert until the trigger is pulled through.
An American-Made Convertible Revolver
Charter Arms has been building revolvers in the USA for over 60 years, and every one is backed by a transferable lifetime warranty. Whether this rides in a nightstand, a pack, or a holster, the caliber flexibility means it earns its keep in more places than a single-chambering snub ever could.
Key Specifications
- Manufacturer: Charter Arms
- Model: Double Dog (Mag Pug/Pit Bull Combo)
- MPN: 13920
- UPC: 678958139204
- Caliber: .357 Magnum / .38 Special / 9mm (two cylinders)
- Capacity: 5 rounds
- Action: Double Action / Single Action
- Barrel Length: 2.2", ported with diamond cuts
- Overall Length: 7.02"
- Weight: 22 oz
- Frame Material: Stainless steel
- Finish: Black passivate
- Grips: Checkered walnut boot style
- Sights: Fixed ramp front, notch rear
- Safety: Transfer bar
- Made In: USA
What’s Included
- Charter Arms Double Dog revolver with .357 Magnum cylinder
- Second 9mm Pit Bull cylinder (no moon clips required)
- Extra crane screw washers
- Owner's manual
Frequently Asked Questions
How do you swap cylinders on the Charter Arms Double Dog?
With the gun unloaded and the action open, remove the crane screw on the front of the frame just below the barrel, slide the cylinder and crane assembly out, drop in the other one, and retighten the screw. It takes about a minute with a screwdriver. Both cylinders are laser engraved with their caliber so you always know which one is installed.
Does the 9mm cylinder need moon clips?
No, and that's the big draw here. Charter's patented extractor uses spring-loaded studs that grip each 9mm case at the extraction groove, so rounds load directly and eject cleanly without clips. Range reports on this system have shown reliable extraction with standard 9mm ammo.
Can the Double Dog Mag Pug shoot .38 Special?
Yes. Like any .357 Magnum revolver, the .357 cylinder safely handles .38 Special and .38 Special +P as well. Between the two included cylinders, this one gun runs three of the most common defensive calibers out there.
Is this revolver a reasonable size for concealed carry?
It's well suited for it. The 2.2 inch ported barrel, roughly 22 ounce weight, and compact boot-style walnut grips keep it easy to conceal in a belt holster, and the barrel porting helps take the edge off muzzle flip with magnum loads. The fixed sights and snag-friendly profile make it a practical everyday snubbie.





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