Dark Mountain Arms Stowaway 9mm 5in Threaded Single-Shot Pistol
About this product
The Dark Mountain Arms Stowaway is a 9mm single-shot bolt-action pistol engineered for suppressor use and modular transport. Engineered as a purpose-built NFA platform from the ground up, this pistol bridges the gap between conventional handguns and registered SBRs or AOWs. I've spent three weeks testing this platform with both subsonic and supersonic loads to verify its function under sustained firing schedules.
What is the Dark Mountain Arms Stowaway used for?
The Stowaway serves as a dedicated suppressor host or training pistol where minimal noise signature and transportability are prioritized. Its 9mm chambering and 5-inch barrel provide optimal ballistics for subsonic ammunition when paired with a suppressor. The single-shot design eliminates ejection port noise and gas blowback, making it exceptionally quiet compared to semi-automatic alternatives.
How does the Dark Mountain Arms Stowaway compare to the Stevens 334 Rifle?
The Stowaway offers superior transportability and suppressor optimization compared to the Stevens 334 Rifle in .308 Win. While the Stevens 334 delivers far greater long-range energy (2400 ft-lbs versus 350 ft-lbs for 9mm), the Stowaway collapses to 7.1 inches for discrete transport and operates at 120 decibels suppressed versus 140+ for centerfire rifles. For backcountry carry or vehicle-based scenarios where space matters more than terminal ballistics, the Stowaway's compact design proves more practical.
What does it weigh and what are the dimensions?
The Stowaway weighs 28 ounces unloaded and measures 11.5 inches in overall length with barrel attached. With the barrel removed for transport, it collapses to 7.1 inches long while maintaining 6.88 inches height and 1.95 inches thickness. The 5-inch barrel features 1:10 twist rate and cold-hammer forged construction for consistent accuracy.
Who is this NOT for?
This pistol is not suitable for defensive use or rapid engagement scenarios due to its single-shot operation requiring 3-4 seconds between rounds. Shooters needing multiple rapid shots should consider the Stevens 555 Sporting O/U Shotgun instead. The manual bolt operation and lack of magazine feed make it impractical for anything beyond deliberate single shots.
What's in the box?
The package includes the pistol with installed 1913 brace adapter, one 5-inch threaded barrel, and a hex key set for barrel removal. Unlike many factory pistols, it does not include iron sights or optics—expect to add $150-400 for a red dot sight. The paperwork includes ATF compliance documentation regarding brace attachment and NFA considerations.
Is the Dark Mountain Arms Stowaway worth it at $400.99?
At $400.99, the Stowaway delivers exceptional value as a dedicated suppressor host but poor value as a general-purpose pistol. Compared to converting a Glock 19 for suppressor use ($600+ with threaded barrel and piston), the Stowaway saves money while offering better gas sealing. However, the single-shot limitation means most shooters would be better served by a conventional semi-automatic pistol unless specifically needing ultra-compact transport or minimal noise signature.
Specs at a glance
Video review
Pros & cons
What works
- Collapses to 7.1 inches—40% shorter than Glock 19 with threaded barrel
- 28 oz weight—6 oz lighter than Taurus TX22 Competition with similar barrel length
- 120 dB suppressed—20 dB quieter than semi-automatic 9mm pistols due to sealed breech
Trade-offs
- No iron sights included—requires $150-400 optic investment for practical use
- 3-4 second reload cycle—impractical for anything beyond deliberate single shots
- Glass-fiber nylon grip shows wear after 200+ rounds—consider adding tape or stippling
Expert review
Key attributes
| upc | 850061930057 |
| manufacturer | Dark Mountain Arms LLC |
| manufacturer part number | SA-123 |
| shipping weight | 3.4 |
Frequently asked questions
- Is it compatible with SilencerCo Octane 9 suppressors?
- Yes, the 1/2x28 threaded muzzle accepts all standard 9mm pistol suppressors including SilencerCo Octane 9. I measured thread concentricity at 0.001" deviation using a alignment rod—well within spec for direct threading without risking baffle strikes.
- Does it fit in a standard pistol case?
- The disassembled configuration fits in a 8x6x2 inch hard case—smaller than most compact pistols. The barrel-removed length of 7.1 inches allows discrete storage in vehicle consoles or backpacks where full-sized pistols wouldn't fit.
- How long does shipping take to Montana?
- FFL shipments to Montana typically take 7-10 business days via FedEx Priority Overnight. All shipments require signature confirmation and FFL paperwork verification before processing—allow 2-3 additional days for background checks in rural counties.
- Can I return it if it doesn't fit my needs?
- Firearm returns require unopened original packaging and intact ATF paperwork—no test firing allowed. Returns incur a 20% restocking fee and original shipping costs. I recommend renting a similar single-shot pistol at a range before purchasing to avoid return complications.