Aperture Sight for Type 100 - 25 kills (Type 100).
Aperture Sight for Thompson - 75 kills (Thompson).
Aperture Sight for SVT-40 - 75 kills (SVT-40).
Aperture Sight for STG-44 - 75 kills (STG-44).
Aperture Sight for PPSh-41 - 25 kills (PPSh-41).
Aperture Sight for MP40 - 75 kills (MP40).
Aperture Sight for M1A1 Carbine - 75 kills (M1A1 Carbine).
Aperture Sight for Gewehr 43 - 75 kills (Gewehr 43).
Get a certain number of kills with the weapons listed below for the desired upgrade(s): If you are invited to play a co-op Zombie Mode game it will be unlocked on your profile afterwords. There is a box here and if you have 950 points or more you can buy a random gun - the Ray Gun or the FG42, for example. In Zombie Mode, when you have 1000 points or more, go to the door that says HELP and on the far left. At the Prestige levels below you unlock the following