The Iver Johnson IJ600 is a .410 gauge over/under break-open shotgun with a 3" chamber and 28" barrels. It weighs 7.10 lbs. The stock is fixed walnut, trigger is gold plated, safety is tang, and the gun ships with five chokes: Full, IC, IM, Modified, and Skeet. 
 

Key Specifications 

• Brand: Iver Johnson Arms 
• Model: IJ600 
• Caliber/Gauge: .410 GA 
• Barrel Length: 28" 
• Chamber: 3" 
• Capacity: 2 rounds 
• Action Type: Break Open 
• Weight: 7.10 lbs. 
• Sights: Bead Front 
• Stock Material: Fixed Walnut (Wood) 
• Trigger Type: Gold Plated 
• Safety Mechanism: Tang Safety 
• Choke Configuration Included: F, IC, IM, M, SK 
   

Features 

 
The over/under configuration puts both barrels in the same vertical plane, which some shooters prefer for consistent sight picture. Five chokes give flexibility across different applications. The walnut stock looks clean and fits naturally. The 28" barrels in .410 provide a reasonable shot column length for the bore size. 
 
At 7.10 lbs, this is heavier than some over/unders in other gauges -- the .410 bore does not reduce the gun's mass, so the package feels more substantial than the caliber might suggest.

The Iver Johnson IJ600 Walnut .410 over/under gets positive marks for its traditional look and the over/under design's handling characteristics. .410 shooters appreciate the manageable recoil and the gun's appeal as a teaching platform for newer shooters.

Build quality is described as satisfactory for recreational use. Some experienced shooters note that the .410 bore's limited payload makes shot placement more demanding than larger gauges, which is a caliber-level consideration rather than a gun-specific issue. A few owners raise concerns about long-term durability under heavy shooting volume, suggesting the gun suits casual hunting and range use better than high-round-count competition. Overall feedback is generally positive for the intended use case.