Shop › PROMAG MKA 1919 12GA 2.75" 20RD DRUM PROMAG MKA 1919 12GA 2.75" 20RD DRUM $139.99 ProMag Industries Drum Magazine, 12 Gauge, 20 Rounds, Fits MKA 1919, Polymer, Black MKA-A1 Quantity: Add To Cart Added! ProMag Industries Drum Magazine, 12 Gauge, 20 Rounds, Fits MKA 1919, Polymer, Black MKA-A1