Quick straightforward video to highlight the ability to save any custom weapon modification into your armory to be used like a blueprint. It's an option on screen when in the MW gunsmith, but it sounds like many people have glanced right over it. Just press left trigger or the 1 key to save a weapon mod, to save you the time of needing to re-apply attachments, camos, charms & stickers whenever you swap weapons on your class. I think it's a great useful feature, plus it's fun to name your own custom variants.
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