The Modern Warfare 2 Slimline Pro is probably one of the best attachments in the game, reminiscent of the impossibly clear red dot sight you could equip in previous CoD games. Since Modern Warfare 2’s release though, there has been an issue with the optic, preventing players from unlocking it. Thankfully, it seems that bug been resolved.
So, how do you go about attaching this optic to your best Modern Warfare 2 guns? Well, as with the other attachments in the multiplayer game, you need to level up a specific weapon platform in the Gunsmith.
How to unlock the Slimline Pro optic
Thanks to an update in the Modern Warfare 2 Gunsmith, we can now see that the Slimline Pro optic is available as part of the Lachmann & Meer weapon platform. Simply level the Lachmann sub Mp5 to level 11. We say its simple, but getting the MP5 SMG itself requires first getting the Lachmann-762 to level 13, and then the Lachman-556 to level 12.
While you’re modding your guns, check out our guides to the best SP-X 80 loadout and the best Vel 46 loadout, two of the guns which, paired together, make up one of our overall best Modern Warfare 2 loadouts. Just imagine how good they would be with a clean optic like the Slimline Pro.