Choate Tool Beretta A-400-10 Shot Extension Blue12 Gauge. These extensions are great for law enforcement officers hunters and competitive shooters by giving them a greater magazine capacity. They are also a must for home protection. These kits are constructed of solid blued steel and come with spring base clamp & follower. Specifications for Choate Tool Beretta A-400-10 Shot Extension Blue: Manufacturer: Choate Tool Magazine Capacity: 10 Round Gun Make: Beretta Caliber: 12 Gauge Country of Origin: USA Features of Choate Tool Beretta A-400-10 Shot Extension Blue Beretta A-400 Xtreme +5 Magazine Extension (Blued) Package Contents: Choate Tool Beretta A-400-10 Shot Extension Blue Choate Tool CMT-20-04-05: Beretta A-400-10 Shot Extension Blue12 Gauge