WanderingFool said:
why use swords when you have automatic weapons that work at a distance...
Because some cities have been using microphones to pinpoint gunshots.
Not a very good idea for an assassination.
Plus, you don't want full automatic weapons. Not even semi automatics. They eject brass away, that you would prefer to keep inside the gun. A bolt action is cheaper than paying for an automatic firearm and then convert it for precision marksmanship.
If you are using an internally suppressed firearm, you will be botching the gas-operated system and force you to use some kind of "retarded blowback" like the Heckler & Koch's MP5/G3, which is fine for battle rifles and submachine guns but not for assassination weapons.
Therefore a integrally suppressed bolt action rifle will be the superior choice. Or just stab the person, poison him, etc.