I am wondering if you can replace the weapons in MW3 with the MW2 versions, for example, making the SCAR-L in MW3 look like the SCAR-H from MW2. I have tried replacing and renaming the IWI files using WinRAR, but it still looks the same. I have also used the CRCfixer.exe and the hex editor like you would use when making custom camos, but that hasn't worked either. I'm stuck on what to do next.
Also, the only thing related to this that I saw on Google was on the alteriw.net forums, which we all know has been shut down, so I can't access that.