If I follow what you are "trying" to say, you want THE ORIGINAL sfx from MW2, and wont settle for real/other game sfx?
Although I have no time for such a useless conversation, I will say this as a final recommendation You are NEVER going to finish this mod if you are going to be picky and choosy over the sfx that you use, as an experienced soldat modder I understand fully the challenge of finding the right sfx, so just be happy with what you can find.
Anyhow, good luck.