Call of Duty: Modern Warfare 2 has a wide array of weapons and weapon attachments for players to use. All of them have different advantages and disadvantages. So, players will need to figure out which are best suited for their playstyles, especially with the new addition of the weapons platform. One noteworthy optical attachment for assault and marksman rifles is the Slimline Pro Optic. This optic is one of the best in the game due to its clear red dot sight, which makes it easy to spot and take down targets. But can you even use this optic in Modern Warfare 2 multiplayer in the first place?
Slimline Pro Optic in MW2 Multiplayer unlock requirements
The Slimline Pro Optic can be unlocked by leveling up the Lachmann Sub to Level 11. This is not a simple task itself as you will need to first unlock the Lachmann Sub itself. To do that, you will have to level up the Lachman-762 to level 13. This will unlock the Lachman-556, which you will then have to level up to level 12. This requires a lot of time to spend in multiplayer if you want to get the Slimline Pro Optic. But in the end, the optic is a great attachment to have on any weapon, and as such, will be worth it.
The Slimline Pro Optic was previously locked due to a bug in the game. Back then, you could only the optic in private multiplayer matches but not public ones. Fortunately, Infinity Ward came out with an update that fixed the issue of unlocking the Slimline Pro Optic, and you can now attach it to any weapon of your choice in the game.