Each default speed in the software isn't specified per gun (except MW3), it's just a general over all speed. If I were you I'd test 7.2 on pistols, the FAL and MK14 and then if you like it, stick with it, if not try and bump it up if it's too slow but each gun has a different speed cap on it so 7.2 may not work on all those guns. You can only make each gun shoot so fast and then if you try and go any higher it will studder and not fire correctly.