The Beretta A300 Ultima KO is a semi-automatic 12 Gauge shotgun built around a 28-inch vent-rib barrel with a 3-inch chamber. It has an aluminum receiver, a steel barrel, and a synthetic stock and forend finished in Mossy Oak Shadow Grass. The receiver is drilled and tapped for mounting optics, and the shotgun feeds from a 3+1 capacity setup. 
 

Key Specifications 

• Brand: Beretta USA 
• Model: A300 Ultima KO 
• Gauge: 12 Gauge 
• Action: Semi-Auto 
• Capacity: 3+1 
• Barrel Length: 28in 
• Chamber: 3in 
• Weight: 7.62 lbs 
• Finish: Mossy Oak Shadow Grass 
• Receiver Material: Aluminum 
• Barrel Material: Steel 
   

Detailed Features 

• 28-inch vent rib barrel keeps a consistent sighting plane for wingshooting. 
• Fiber optic front sight paired with a steel mid bead gives a fast sight picture. 
• Beretta/Benelli Mobil choke system lets shooters swap chokes for different loads. 
• Drilled and tapped receiver accepts an optic mount directly. 
• Synthetic stock and forend in Mossy Oak Shadow Grass suit waterfowl and upland cover.

Owners of the Beretta A300 Ultima line generally describe it as dependable, pointing to the same smooth cycling and soft-shooting feel Beretta's semi-autos are known for. The Mossy Oak Shadow Grass finish and 3-inch chamber make the KO configuration a popular pick with duck and goose hunters who want one gun that handles a mix of shell loads without extra fuss.

Field reports on the A300 Ultima tend to praise the balance and pointing feel of the vent-rib barrel and synthetic stock, though a few owners note the drilled-and-tapped receiver adds a bit of weight up top once an optic is mounted. The fiber optic front sight gets consistent praise for quick target acquisition in low light.

On value, the A300 Ultima is often seen as an accessible entry into Beretta's semi-auto shotgun lineup, with parts and service that are easy to find. Some shooters wish the base package shipped with more choke tubes, but most consider the Beretta/Benelli Mobil choke system itself a plus since it opens up aftermarket choke options down the road.