The Beretta A300 Ultima KO is a 20-gauge semi-automatic shotgun chambered for 3-inch shells with a Realtree Max-7 camouflage finish. It has a 28-inch barrel, weighs 6.76 lbs, and holds 3+1 rounds. 
 

Key Specifications 

• Brand: Beretta USA 
• Model: A300 Ultima KO 
• Gauge: 20 GA 
• Capacity: 3+1 rounds 
• Barrel Length: 28" 
• Weight: 6.76 lbs 
• Action Type: Semi-Automatic 
• Chamber Size: 3" 
• Overall Length (OAL): 47.62" 
• Sights: Fiber Optic Front 
• Stock Material: Synthetic (Fixed Kick-Off) 
• Finish Color: Realtree Max-7 Camouflage 
   

Detailed Features 

 
The A300 uses a gas operating system that cycles various loads consistently, from light upland field loads to heavier 3-inch hunting shells. The Kick-Off (KO) hydraulic recoil reduction system is integrated into the stock and absorbs a meaningful amount of the impulse on heavier loads, especially relevant in a 20-gauge where loads can run hot for turkey or late-season pheasant. 
 
The MobilChoke configuration accepts a wide range of Beretta choke tubes. The fiber optic front sight is useful in low light. At 6.76 lbs, the gun is light enough to carry all day, and the 20-gauge bore produces less recoil than a comparable 12-gauge, making it a practical choice for shooters who want a do-everything upland and waterfowl gun. 
 
The Realtree Max-7 pattern uses blues, grays, and greens and was developed for marsh and flooded timber environments.

The A300 Ultima KO in 20-gauge gets positive marks for its combination of light weight, the Kick-Off recoil system, and reliable cycling. Hunters who use it for upland birds and waterfowl appreciate that one gun handles both seasons without adjustment. The Max-7 camo gets specifically called out for working well in wetland and grassland environments.

Critiques focus on price relative to competing 20-gauges, a break-in period some users experience before the action cycles 100% cleanly with lighter loads, and weight distribution that a few shooters find less balanced than they'd prefer for swing-through shooting. Limited aftermarket customization options are mentioned, though most owners don't need them. Overall reception is favorable, with the KO recoil system and cycling reliability cited most often as reasons to buy.