American Tactical Magazine, Bulldog, 12 Gauge, 5 Rounds, Fits ATI Bull-Dog SGA, Black ATIM12BD5 Whether at the range or in the field, ATI factory-original magazines are a convenient means of carrying extra ammunition. Ideal for the demanding, high-volume use you require, genuine ATI factory replacement magazines are manufactured to the exact same specifications and tolerances, and use the same manufacturing materials as the original parts, ensuring proper fit and reliable operation. This magazine has a capacity of 5 rounds.