There are two types of weapon specialists (in general): the broad specialist, and the specific specialist.
A broad specialist can use any type of weapon. Pistol? Yes. Sword? Yes. Minigun, monofilament whip, rocket launcher, commercial explosives, mounted turret, sniper rifle? You better believe it. If it can be used to inflict harm upon another metahuman, then this weapon specialist can use it (to inflict harm upon a specific other metahuman).
The specific specialist can use one (or a couple) types of weapons better than anyone else. The sniper who can shoot flies out of the air from a klick away. The gunslinger who draws faster than anyone in the Old West. The fencer who, if given a lightsaber, could probably deflect laser rifle fire. That big troll with the minigun down the street who, when told that miniguns are inaccurate, shoots a target with less spread than most expert pistoleers’ spread.