I assume other people have noticed before, but, the magazine on the MK20 SSR “Herald” custom skin kinda has issues. Basically, you’re never going to see the skin’s intended magazine. If you use an attachment for the magazine slot that doesn’t change the default model on a normal MK20, the skin will actually show correctly in the weapon mod menu, but in game, you’re stuck with the normal tan magazine of the default MK20, rather than the black and gold of the Herald skin. If you want to see the magazine of the Herald as it’s supposed to be (black with a gold baseplate) you have to just leave that slot empty.