Dark Mountain Arms Stowaway | 5.7x28mm | 5in Threaded

The Dark Mountain Arms Stowaway is a single-shot, bolt-action pistol built for compact versatility and straightforward maintenance. Chambered in 5.7x28mm, this configuration features a removable 5-inch barrel with a 1/2×28 threaded muzzle and a 1913-style adapter to accept a folding brace (all NFA laws apply). The upper is optics-ready with a Picatinny rail; a low-profile red-dot such as a Vortex Venom 3 MOA pairs well and stays comfortably under $1,000.

Its design supports precision single-shot target work and compact transport or field carry where a lightweight, easily serviceable platform is desired.

Product Specifications

• The manufacturer is Dark Mountain Arms.
• The model is the Stowaway.
• The caliber is 5.7x28mm.
• The action is bolt-action single-shot.
• The barrel measures 5 inches and is removable for transport or caliber change.
• The muzzle is threaded 1/2×28 for suppressor or muzzle device compatibility.
• The handgun includes a 1913-style adapter to add a folding brace (all NFA laws apply).
• The rail system is a Picatinny optics-ready rail.
• The finish is black.
• The primary materials are aluminum, steel, and glass-filled nylon.
• The safety is a single action with a half-cock position.
• The firing length with the barrel attached is 11.5 inches.
• The length with the barrel detached is 7.1 inches.
• The height is 6.88 inches and the thickness is <2.0 inches.
• The UPC is 850061930064.

This Stowaway configuration emphasizes modularity and low-profile carry without unnecessary complexity. The removable barrel and straightforward bolt-face swap make caliber experimentation and maintenance simpler than many compact platforms, while the Picatinny rail and threaded muzzle allow for optics and muzzle device options commonly used by precision-oriented shooters. The 1913 adapter gives a route to adding a foldable brace for more stable operating positions where legal to do so.