Description
Some guns are built to sit in a safe. The Dark Mountain Arms Stowaway is built to go with you. This large-format, bolt-action single-shot pistol is chambered in 9mm and designed around one big idea: take up as little space as possible without giving up capability. The 5-inch barrel comes off quickly, dropping the whole package down to roughly 7 inches so it disappears into a backpack, a truck kit, or a bug-out bag. Reassembly is fast and tool-free, so it goes from stowed to ready in short order.
What Makes the Stowaway Different
The barrel itself is 4140 steel with a black nitride finish and a 1:9 twist, capped with a 1/2×28 threaded muzzle that accepts suppressors, compensators, and other common muzzle devices. Up top you get an optics-ready Picatinny rail for a red dot or micro prism, and the B5 Systems AR-pattern grip gives it a familiar feel in hand. The receiver is aluminum, paired with steel and glass-filled nylon components, and the whole pistol weighs right around 2 pounds. The single-action trigger includes a half-cock position, and routine takedown for cleaning requires zero tools.
One Stowaway, Multiple Calibers
Here is where this pistol really stretches its legs. Swap the bolt face and barrel and you can convert the Stowaway to another compatible chambering, like 5.7x28mm, without buying a whole second gun. That kind of flexibility is a big deal for anyone who wants options based on what ammo is on the shelf or what the day calls for.
Built in the USA for the Backcountry
Dark Mountain Arms is a veteran-owned outfit, and the Stowaway is made in the USA with hunters, campers, and preparedness-minded folks in mind. Whether you are stashing it as a trail companion, running it suppressed for quiet small-game work, or just enjoying a simple, well-thought-out single shot at the range, this is a pistol that does a lot with very little bulk.
Key Specifications
- Manufacturer: Dark Mountain Arms LLC
- Model: Stowaway Pistol
- MPN: SA-121
- UPC: 850061930033
- Caliber: 9mm Luger (9x19mm)
- Action: Bolt Action, Single Shot
- Capacity: 1 Round
- Barrel Length: 5"
- Barrel Material: 4140 Steel, Black Nitride Finish
- Twist Rate: 1:9" RH
- Muzzle Thread: 1/2×28 TPI
- Overall Length (Assembled): 11.5"
- Length (Barrel Detached): 7.1"
- Weight: Approx. 2 lbs
- Grip: B5 Systems AR-Pattern
- Optics Mount: Picatinny Rail
What’s Included
- Dark Mountain Arms Stowaway single shot pistol
- 5-inch threaded 9mm barrel (installed)
Frequently Asked Questions
Can I mount a suppressor on the Dark Mountain Arms Stowaway?
Yes. The 5-inch barrel is threaded 1/2×28, which is the standard pitch for most 9mm suppressors, compensators, and flash hiders. Just spin off the thread protector-style barrel sleeve and attach your device. It is one of the most popular ways to run this pistol.
Can the Stowaway be converted to other calibers?
It can. The Stowaway is designed for quick caliber swaps using just a bolt face and barrel change, with 5.7x28mm being the other current factory chambering. Dark Mountain Arms sells caliber conversion kits, so one receiver can cover multiple roles.
How small does the Stowaway pistol get for storage?
With the barrel removed, the receiver measures right around 7.1 inches long, and fully assembled it runs about 11.5 inches. At roughly 2 pounds, it tucks easily into a backpack, glove box, or survival kit. Reassembly is quick and requires no tools.
Does the Stowaway come with sights or an optic?
No iron sights or optic are included. The pistol ships optics-ready with a Picatinny rail on top, so you can mount a red dot, micro prism, or similar sight of your choice. Lightweight micro red dots pair especially well with its compact, packable design.




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