hey i think i found the problem. Any gun whether secondary or primary has this problem if its auto .... for example take aps pistol from the first weopon set(auto-pistol), do the hack on this pistol and it wont work. take any weopon from the first set. lets say mp5 it also wont work. whereas other pistols (that are not automatic) and snipers and shotguns like IZH and MP-133 that are 1 shot per click. they hack works fine on them. So basically it has something to do with automatic pistols and rifles. just saying