The Kel-Tec SUB2000 in 5.7x28mm is a folding, semi-automatic carbine built for compact storage and transport. This 10-round, CA-compliant configuration has a 16.5-inch threaded barrel, factory iron sights, and a top rail for mounting an optic. The carbine is finished in black and is offered here as a Camfour Exclusive build. 
 

Key Specifications 

• Brand: Kel-Tec 
• Model: SUB2000 
• Caliber: 5.7x28mm 
• Action: Semi Auto 
• Capacity: 10 Rounds 
• Barrel Length: 16.5in 
• Finish: Black 
   

Detailed Features 

• Folds in half for storage in a backpack or small case 
• 16.5-inch threaded barrel accepts a suppressor or other muzzle device 
• Factory iron sights come installed, with a top rail for adding a red dot or scope 
• 10-round magazine configuration meets CA-compliant capacity limits 
• Black finish throughout for a low-visibility, utilitarian look 
• Chambered in 5.7x28mm for a flatter-shooting, pistol-caliber carbine option

The SUB2000 has a long track record in 9mm and .40, and the 5.7x28mm version brings the same folding design to a flatter-shooting cartridge. Owners generally report it runs reliably once broken in, though the folding hinge and stock latch are the parts people watch most closely over time.

The main appeal is how small the SUB2000 folds for storage in a bag or under a seat, and most owners say it deploys quickly when needed. The 16.5-inch barrel keeps handling light, and the threaded muzzle plus top rail make it easy to add a suppressor or optic without extra gunsmithing.

5.7x28mm ammunition costs more and is less common on shelves than 9mm, which some owners weigh against the flatter trajectory and lighter recoil the cartridge offers. Aftermarket support for the SUB2000 platform, folding stock kits and rail accessories, is fairly mature at this point, which owners like for a budget-friendly carbine.