I'm not suggesting that you go in unarmed. There have been many times that I can think of in games I've run where people have got into melee and martial arts fights while armed with firearms. Face to face negotiations during a trade could go horribly wrong, for instance. And in one mini-campaign I ran in which the PCs were French Foreign Legionnaires on a mission near the Iran-Iraq border the game culminated in a vicious fight among the thorn bushes with a bunch of Spetznaz, a couple of the PCs got down to one magazine left each and then fixed bayonets and charged in to meet their ends in ways befitting of real men