I believe you are correct. Even adding the guns to default classes the game won't let you choose that class unless you have that gun unlocked. Amazing the lengths they've gone to to keep them from being used in a mod. A workaround would be to make your own weaponfiles of a different name and then add those to the mp_stattable. All assets are already in game so you just need to know the names of the models, animations, sounds, and have all the stats for the gun to recreate the files.i THINK there lock status are determined by some other file we don't have.