Depending on situation, character build and aim there are four weapons my gunslingers usually carry:
1) Defiance-Ex Shocker: Legal, powerful and easily concealed. The perfect weapon to carry around in everyday situations. Short range makes it an ambush and indoors weapon.
2) Ruger Super Warhawk: High damage, high AP with decent ammo capacity, great in combination with ammo select. Works incredibly well in combination with a shield
3) Savalette Guardian: Burstfire, smartgun system included allow you to hit and damage opponents with high defense. Works well with increased size magazines
4) Cavalier Champion: Even stronger than the Warhawk, but needs a special build to work well (either get a few of them or be an adept with nimble fingers and a GM that allows you to have that power also work for quick reloading of single bullets)
Honorable mention:
Streetline Special modded with ceramics and loaded with capsule rounds