Gunmancer

You die, you appear in new world... typical isekai beginning, right? You get one skill though, you become gunmancer! You can summon any military equipment from your previous world - be it small guns, rifles, grenade launchers, humvee with minigun, night vision, even B2 bomber if you want. Nothing kills dragons and goblins better than AR-15 or freaking automatic grenade launcher, am i right?