The Beretta A400 Xtreme Plus KO is a 12-gauge semi-automatic shotgun with a 28" Steelium Plus barrel and a 3.5" chamber that also accepts 3" and 2.75" shells. The GORE OPTIFADE Marsh camo finish is purpose-built for wetland hunting. Total capacity is 3 rounds (2+1). 
 

Key Specifications 

• Make: Beretta 
• Model: A400 Xtreme Plus KO 
• Gauge: 12 GA 
• Action: Semi-Automatic 
• Barrel Length: 28 inches 
• Chamber Size: 3.5 inches (accepts 3" and 2.75" shells) 
• Capacity: 2+1 rounds 
• Weight: 7.4 lbs (118.4 ounces) 
• Finish: GORE OPTIFADE Marsh 
   

Detailed Features 

 
Beretta's Blink gas-cycling system is the main mechanical differentiator here. It cycles faster than most inertia systems and handles low-base loads reliably. The Steelium Plus barrel is cold-hammer forged for consistent bore geometry. Kick-Off Mega is a hydraulic stock damper that reduces felt recoil noticeably, which matters over a full day of shooting steel loads. Front fiber optic bead and integral mid-bead give a clear sight picture across lighting conditions. The crossbolt safety is ambidextrous. 
 

Usage 

 
This gun is built around waterfowl hunting. The 3.5" chamber handles heavy steel loads for geese, the OPTIFADE Marsh pattern works in marshes and flooded fields, and the Kick-Off system makes the inevitable long days with heavy 3.5" loads more manageable. It also works for clay shooting, though the 7.4 lb weight is noticeable during a high-round sporting clays course.

Owners of the A400 Xtreme Plus KO in OPTIFADE Marsh consistently highlight the Kick-Off recoil system as the gun's most meaningful feature. It makes repeated shooting with 3" and 3.5" steel loads noticeably less punishing. The Blink gas system gets credit for cycling a wide range of loads reliably, including lighter field loads that can frustrate inertia-operated guns.

Waterfowl hunters appreciate the camo pattern's effectiveness in marsh environments, and most find the 28" barrel a practical all-around length. Weight (7.4 lbs) comes up regularly; most accept it as a reasonable tradeoff for the recoil reduction and wet-weather durability, but it can be tiring on long walk-and-shoot days. Price is a common thread. Most owners consider the Kick-Off system and Beretta build quality worth the premium, while some point out that competing semi-autos achieve similar reliability at lower cost.

New semi-auto shooters sometimes note a learning curve with the gas system's maintenance requirements compared to simpler pump-action guns.