Call of Duty: Modern Warfare 2 is packed with weapons and add-ons that players can unlock as they dive into the game. However, add-ons and weapons are significantly different in Modern Warfare 2.
This can be confusing for the inexperienced, and even experienced players will likely need a few hours to understand how to unlock certain weapons or attachments. However, some add-ons such as the Slimline Pro Optic Red Dot Sight for the M4 weapon platform currently do not 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?
Unfortunately, there is currently no way to unlock Slimeline Pro Optic Red Dot Sight in standard multiplayer modes. Players can use the add-on in private matches, but not in public games. There is no explanation explaining how to open the add-on when hovering over the Gunsmith menu, which leaves players confused.
The addon is also available in the story mode and it is not yet known why it is not available in the more popular multiplayer mode. Activision will likely fix this issue in a future patch. Infinity Ward to develop Modern Warfare 2 game updates released, and we hope the Slimeline Pro Optic Red Dot Sight gets a similar edit.
More weapons are likely to come in future Modern Warfare seasons, and the Slimline Pro Optic Red Dot Sight can be unlocked based on one of these weapon platforms. By the way, consider other optics for now when equipping the M4 gun.
Unavailable add-ons are just one of the issues found in the new Gunsmith system in Modern Warfare 2. They complain quite a lot about this complex system as players have to unlock certain platforms to unlock certain weapons.
For example, the Vaznev-9k is a popular weapon used by professional gamers, but three different weapons must be unlocked before this weapon can be used. Fortunately, this weapon can be unlocked in the base game, unlike the unreachable Slimline optic.
Other classic CoD content such as Barracks and Hardcore playlists are not currently available in Modern Warfare 2. Hopefully, these features will be added along with the missing optics in a future update.
If there is a way to open the Slimline Pro Optic Red Dot Sight plugin, we will update this article for you!