How to unlock the Slimline Pro Optic Red Dot Sight in Modern Warfare 2

Call of Duty: Modern Warfare 2 is full of weapons and attachments players can unlock as they grind the game. However, the attachments and weapons are significantly different in Modern Warfare 2, as weapons share the same attachments if they share the same platform. 

Image via Infinity Ward

This can be confusing to the uninitiated, and even veteran players will likely need a few hours to understand how to unlock certain weapons or attachments. But some attachments, like the Slimline Pro Optic Red Dot Sight for the M4 weapon platform, currently don’t have a clear explanation of how to unlock them. So, how exactly do you unlock the Slimeline Pro Optic Red Dot Sight in Modern Warfare 2?

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