The Savage Arms 320 Security Thumbhole is a 12-gauge pump-action shotgun with an 18.5-inch barrel, 5+1 capacity, and a synthetic thumbhole stock in matte black. 
 

Key Specifications 

• Model: 320 Security Thumbhole 
• Gauge: 12 GA 
• Chamber: 3" 
• Action: Pump Action 
• Capacity: 5+1 rounds 
• Barrel Length: 18.5" 
• Overall Length: 39.1" 
• Weight: 7.2 lbs 
• Sights: Front Bead Sight 
• Stock Material: Synthetic with Thumbhole design 
• Finish Color: Matte Black 
   

Detailed Features 

 
The thumbhole stock gives the shooter a different grip geometry than a conventional pistol grip or straight stock, which some find improves stability and control particularly in defensive applications. The pump action cycles reliably. The 18.5-inch barrel keeps overall length to 39.1 inches. The 5+1 capacity is above average for defensive shotguns. The chrome-lined barrel improves durability and simplifies cleaning. Weight at 7.2 lbs. is standard for the configuration. 
 

Usage Notes 

 
The compact 18.5-inch barrel and thumbhole stock make this well-suited to home defense. At 5+1 rounds it has more capacity than many short-barreled alternatives. Recoil from a 12-gauge in a 7.2 lb. package is noticeable -- this is not a light-shooting gun.

The Savage 320 Security Thumbhole gets credit for reliability, ease of use, and value relative to its price. The pump action is described as smooth and accessible to new shooters. The thumbhole stock design is cited positively for comfort and stability, which makes it well-regarded for defensive use.

Affordability is a consistent theme -- most users consider it a solid entry-level option. Build quality gets mixed treatment: many find it satisfactory for the price, while some feel certain components could be more robust. Recoil is a recurring discussion; a few shooters find it harsh, particularly those not accustomed to 12-gauge loads. Weight draws some criticism for extended carry. Aesthetics are split -- the matte black tactical appearance appeals to some buyers while others prefer more traditional designs.