The Beretta USA A400 Solo KO is a 12 Gauge semi-automatic shotgun with a 28-inch vent rib barrel and a 3-inch chamber. It has a black synthetic stock, ambidextrous controls, and a Kick-Off recoil reduction system, along with a 2+1 capacity configuration. The receiver is drilled and tapped and finished in matte blue, built for waterfowl use. 
 

Key Specifications 

• Brand: Beretta USA 
• Model: A400 Solo KO 
• Gauge: 12 Gauge 
• Action: Semi-Automatic 
• Capacity: 2+1 
• Barrel Length: 28" 
• Chamber: 3" 
• Finish: Matte Blue 
   

Detailed Features 

• Steelium vent rib steel barrel with a bead front sight 
• Optima HP choke system, includes Full, Improved Cylinder, and Modified chokes 
• Ambidextrous controls with a crossbolt safety 
• Drilled and tapped receiver for scope or optic mounting 
• Black synthetic stock with a 14.38-inch length of pull, built for waterfowl applications

Owners of the A400 Solo KO and the broader A400 line generally describe the gas system as soft-shooting and reliable across both light target loads and heavier steel shot, which matters for a dedicated waterfowl gun. Beretta's build quality on this line gets consistent praise, though some hunters note the felt recoil reduction from the Kick-Off system is more noticeable with heavier loads than lighter ones.

In the field, the ambidextrous controls suit both right and left-handed hunters, and the black synthetic stock holds up well to wet, cold conditions typical of duck and goose hunting. The drilled and tapped receiver gives an easy path to mounting an optic for some hunters, though most run it with the factory bead sight as intended.

On value, the A400 Solo KO sits toward the upper end of the semi-auto shotgun market, and opinions split on whether the price is justified against other Beretta or competitor autoloaders. Beretta's Optima HP choke system and parts support are widely available, which owners see as a plus for long-term upkeep.