The Kel-Tec SUB 2000 Gen 2 is a semi-automatic rifle chambered in .40 S&W with a folding stock design that collapses for compact storage or transport. 
 

Key Specifications 

• Manufacturer: Kel-Tec 
• Model: SUB 2000 Gen 2 
• Caliber: .40 S&W 
• Barrel Length: 16.25 inches 
• Capacity: 13 rounds (compatible with Glock magazines) 
• Weight: 4.3 lbs 
• Finish Color: OD Green 
• Type: Semi-Automatic Rifle 
• Twist Rate: 1:16 RH 
   

Detailed Features 

 
The folding stock is the defining characteristic here. The rifle folds in half for storage in a backpack or vehicle and deploys quickly. The salt bath nitride finished steel barrel is durable and straightforward to maintain. An adjustable front sight and fixed rear sight provide basic targeting. The crossbolt safety is a simple, intuitive mechanism. 
 
Glock magazine compatibility is a practical advantage: if you carry a Glock in .40 S&W, you share ammunition and magazines between the two firearms. The 4.3 lb weight makes this one of the lighter rifles in this category.

The Kel-Tec SUB 2000 Gen 2 in OD Green .40 S&W has a loyal following mainly because of its portability and the Glock magazine compatibility. The folding design gets consistent praise for how practical it is, small enough to fit in a backpack, deploys fast. The .40 S&W caliber is reasonably capable for close to medium range with manageable recoil.

On the downside, the trigger pull gets frequent criticism from shooters who prefer precision work. Some buyers note that the polymer components feel less substantial than traditional rifle construction, though this is partly why the rifle weighs 4.3 lbs. Ergonomics are a matter of opinion. Some find it comfortable, others don't. The OD Green finish is neutral and practical.