[Help] From CA modding to AVA modding...

I tried to do a simple switch-up of 2 different gun models (the .upk files to be exact), but as expected...theres more to it than that. What I'm asking for is a UPKExtracter type of tool if it does exist. Anyone know? Thanks in advance.

I'm going to go looking for one..

So far no one has figured out how to extract .UPK files.. Using the information previously stated I'm gonna take a guess that maybe there isn't a UPKextracter. (not trying to sound like a smartass)