The Gatling Gun is a secret weapon found in Resident Evil 3: Nemesis. To obtain it, get $3000 in the bonus Mercenaries mini-game and buy it. Load the game and choose 'Restart' to start a new game.
This powerful weapon has infinite ammunition and an incredibly fast rate of fire. The player is able to mow down any enemy with ease in only a few seconds. The only draw back is that it takes a moment for the weapon's barrels to spool up and then another few seconds for the turret to begin to fire. This means that you must fight enemies from a distance.
This weapon is identical in looks and performance to the Resident Evil 2 Gatling Gun, the only difference being that it takes only one inventory space, rather than two, as was the case with the same weapon in Resident Evil 2.