The Iver Johnson MC3 is a youth single-shot shotgun chambered in .410 bore with a 24-inch barrel. It has a black finish with a wood stock and accepts 3-inch shells. The MC3 is sized for younger or smaller-framed shooters. 
 

Key Specifications 

• Brand: Iver Johnson 
• Model: MC3 
• Caliber: .410 Bore 
• Barrel Length: 24 inches 
• Color/Finish: Black / Wood 
   

Detailed Features 

• Single-shot break-action configuration 
• 24-inch barrel 
• 3-inch chamber 
• Wood stock with black finish 
• Youth-scaled dimensions

The MC3 is bought primarily as a first shotgun for young or smaller-framed shooters. Owners consistently note that the .410 bore keeps recoil light enough for beginners, and the 24-inch barrel length is cited as practical for youth fit without being unwieldy.

Build quality feedback is mixed. The wood stock finish gets comments ranging from acceptable to rough, and some owners note the fit required adjustment before use. At the price point, expectations are appropriately modest and most buyers report it functions as intended.

The single-shot format is intentional for this use case. Teaching safe handling is easier with one round at a time, and owners who buy the MC3 for that purpose report satisfaction. It is not a gun that gets praise as a long-term or performance piece.