"I wanted a Masterkey for my M60"
Isn't that what grenades are for?
I've noticed military/ paramilitary people tend to pick military guns, whereas normal sci-fi fans go for the more sci-fi-ish weapons.
Not always. Depends on what the "situation" or game is. In a game like SR, yeah sure. But I tend to opt for more muti-purpose weapons. And Like CanRay said, you can't go wrong with shotguns. When I create any character of any game, I tend to use a "bracket" approach to weapons. Example...
1) Main/Primary Weapon: This is the weapon you use most often, also can be a signature weapon. For SR, that would normally be an Assault Rifle or SMG. In a more fantasy setting, think battleaxe/longsword/Bastard sword.
2) Secondary weapon: A weapon to go to if the primary weapon goes poof or if it becomes impractical. For example, moving from an open battle field to a CQB. An assault rifle would be unwieldly while that SMG, shotgun, or even a heavy pistol would be ideal. A warhammer, morning star, or shortsword usually fill the bill in other settings.
3) Long range weapon. Sometimes you got to reach out and touch someone. Unless Im specifically playing a longgunner, an assault rifle usually fills this nitch or in other cases a Longbow or heavy crossbow.
4) "Speciality" weapon. In fantasy settings this is usually my blunt weapon for dealing with things like pesky skeletons or things that slashing/piercing dosent work...or if I dont WANT to kill things right away. For something like SR, think specailty rounds, tasers, shock gloves, etc
5) Consealed Carry or "Battle Casual". In some games you cant walk down the street or will be in situations where the heavy or obvious stuff would cause problems. A consealed heavy pistol or light pistol with specialty rounds or a shortsword and daggers I like best for this.
6) Weapon of last resort. When all else has failed, and you need to do something NOW, this is what I try to have. It depends on the character what form this takes, but I have used everything from shaped grenades, a Ruger Warhawk, a poison dagger, to a spiked helm (think headbutt of doom).
Now a lot of these weapons tend to overlap in terms of purpose, but ultimately the point is I like to have at least something for every occasion on me at all times whenever possible