The Kel-Tec Sub-2000 Gen3 Multi Mag is a semi-automatic pistol-caliber carbine chambered in 9mm with a 16.1-inch threaded barrel. It folds in half at the receiver hinge for compact storage and transport, and the Multi Mag configuration accepts Glock 19/17-pattern handgun magazines. The carbine breaks down without tools for cleaning or inspection. 
 

Key Specifications 

• Brand: Kel-Tec 
• Model: Sub-2000 Gen3 Multi Mag 
• Caliber: 9mm 
• Action: Semi Auto 
• Capacity: 15 rounds 
• Barrel Length: 16.1 inches 
• Overall Length: 29.2 inches (16.15 inches folded) 
• Weight: 4.2 lbs unloaded 
• Twist Rate: 1:14 
• Finish: Black 
   

Detailed Features 

• Folds completely in half for compact storage in a backpack or vehicle 
• Accepts Glock 19/17-pattern handgun magazines in the Multi Mag configuration 
• Threaded barrel for muzzle device attachment 
• Tool-free takedown for cleaning and inspection 
• 5-lb trigger pull weight

Owners of the Sub-2000 line generally trust the platform's reliability once it is broken in, and Kel-Tec's reputation for unusual but functional designs carries over to the Multi Mag version. A common early step is running the carbine with a few different magazine brands to confirm the Multi Mag insert locks up tight, since fit can vary slightly between makers.

The folding design is the carbine's signature feature, and most buyers pick a Sub-2000 specifically for the compact folded length and easy storage. Handling opinions split a bit: some shooters like the balance and manageable recoil of a 9mm carbine, while others find the polymer stock and grip less refined than a dedicated rifle-pattern gun.

Being able to run Glock-pattern magazines is a major draw for owners who already carry a Glock 19 or 17, since it lets them standardize on one magazine type between pistol and carbine. Aftermarket support for the Sub-2000, including optics mounts, slings, and folding brackets, is broad enough that most buyers find it easy to accessorize on a budget.