This mod is SpecOps's custom sequel to CoD4. The campaign is based on what happens to Captain Mac after the mission 'Heat' (see the description for more information on the campaign). The mod also supports 'Zombies' and 'Survival' gametypes. It is currently in Alpha (0.15) development and therefore the public download only includes the 'Survival' gametype. This is a non-profit and non-commercial mod.
I demonstrate upgrading:
AK-47 -> AK-47 Red Dot Sight