How to download and install:
1) Create a folder called DCOY_15
2) Download: The Modern Weapons Mod
The Modern Weapon Mod Update
3) Put these downloads in the DCOY_15 folder.
4) Now put the DCOY_15 folder in the Call of Duty folder.
5) This location is often C:\Program Files\Call of Duty
Now you should be able to play.
Any problems pm me.