The Iver Johnson 600 is an over/under break-action shotgun chambered in .410 bore with a 28-inch ventilated rib barrel and a 3-inch chamber. It holds 2 rounds and comes with a black walnut stock. The receiver pairs with a CT5 choke configuration. 
 

Key Specifications 

• Brand: Iver Johnson 
• Model: 600 
• Caliber: .410 Bore 
• Action: Break Action (Over/Under) 
• Capacity: 2 rounds 
• Barrel Length: 28 inches 
• Chamber: 3 inch 
• Color/Finish: Black Walnut 
   

Detailed Features 

• Over/under configuration with ventilated rib barrel 
• 3-inch chamber for standard .410 loads 
• Black walnut stock with wood forend 
• CT5 choke tube included 
• 2-round break-action design

Owners of the Iver Johnson 600 in .410 typically pick it up as a light, trim over/under for small-game or introductory shooting. The walnut stock draws consistent praise for its look relative to the price, and the 28-inch barrel gives it a balanced feel that new shooters appreciate.

The break-action simplicity is a plus for many, but the trigger on the 600 splits opinions. Some find it acceptably crisp for the price; others feel it needs smoothing before it reaches its potential. The 3-inch chamber is welcome for versatility with standard .410 shells.

Value comes up frequently in owner discussions. At its price point, the 600 is seen as a workable entry into .410 over/unders rather than a long-term heirloom piece. Aftermarket support is limited, so buyers largely take it as-is from the factory.