Collections

Collections are a feature available in Call of Duty: Modern Warfare Remastered, Call of Duty: WWII and Call of Duty: Modern Warfare III, with a similar system being featured in Call of Duty: Infinite Warfare. Collections function as a method of unlocking unique pieces of cosmetic gear and weapon variants by collecting "sets" of items from Supply Drops. Collections can be made up of any item obtained from a Supply Drop, excluding weapon variants in Call of Duty: WWII. Within Call of Duty: Infinite Warfare however, the QR-M5TR Collection and Mark II Collection simply exists to showcase what weaponry have weapon variants alongside what Weapon Perks the weapons come with. 
Category:Call of Duty: Modern Warfare Remastered Customization
Category:Call of Duty: WWII Customization
Category:Call of Duty: Modern Warfare III Customization