Shop › PROMAG MKA 1919 12GA 2.75" 15RD DRUM PROMAG MKA 1919 12GA 2.75" 15RD DRUM $124.99 ProMag Industries Magazine, 12GA, 2.75", 15 Rounds, Fits MKA 1919, Polymer, Black MKA-A3 Quantity: Add To Cart Added! ProMag Industries Magazine, 12GA, 2.75", 15 Rounds, Fits MKA 1919, Polymer, Black MKA-A3