The Unlimited Submachine Gun is an unlockable firearm in Silent Hill 3. It is unlocked when Heather Mason defeats the final boss with a melee weapon, and the player will then have to play an Extra New Game to use it. It is found once the player exits the mall through the window and heads left into the alley. The unlimited submachine gun, just as the name says, has automatic fire and unlimited ammunition.
Using the unlimited submachine gun detracts from a 10 Star Ranking.
- Finding the unlimited submachine gun in the HD Collection unlocks the trophy/achievement "Heather's Got A Gun," the title likely being a reference to the Aerosmith rock song "Janie's Got A Gun".
- Using this weapon on a Pendulum while it is airborne will cause the creature to move at incredibly high speeds.