It is in the Palisades mall, when you go through the Atlantica Casino, up the right escelators, and go on the curve right, and you should be at High noon shooting range, and there will be looters the first time.
I'm guessing you mean where do you get infinite ammo from in dead rising you have to go to the gun shop in the part of the mall that is under construction (you can get there from outside) then go threw keep to the right then the first hall you see there will be a sign go down the hall and you'll get in the gun shop kill Cletus and you can take guns when ever you want to.
The only purpose I have found for it is to buy guns from the gun shop.
It's at the end of the hallway you take to get to Carlito's hideout.
in the north plaza, when you exit carlitos hideout go straight to the west (left)
its in the unfinished shop in the north plaza, you find it when you go and do case 5-1
There is no rocket launcher in Dead Rising, the most powerful gun is the real megabuster.
So once you beat the game you get that special gun. Then you Start the game over right... So that means u got to play the game till you get to the point where you get to the gun shop and you will be able to buy it.
Gun shop or gun show or pawn shop,.
There is no dang gun shop so be quiet with the ' wheres the gun shop'
psychopaths (roughly in order of apperance) kent, the photograther cletus, the gun-shop owner adam, the clown convicts, the jeep drivers cliff, the veteran sean, the cult leader jo, the policewoman rogers family, the snipers paul, the pyromaniach
Well there is assault rifles but not any sub machine guns that I know of.
I used the machine gun but a sword also be quite good WARNING he is very hard! hope this helps :D