Hey,
I looked into it, but it doesn't seem to be the place, as I'm looking to change the longgun selection of swat units, and that file doesn't contain the term "advancedrifle". The only file I have been able to find so far which contains the swat unit loadouts has been the "DefaultRegions.xml" file, but as stated before, any changes to that file don't have an effect on the game. Thank you for your suggestion though.