Switching Weapons
During gameplay you cannot change weapons except by picking up new ones but what you can do to switch weapons is access the 'Weapon' select screen, quit gameplay to the 'Main' menu then resume the level. If you do this you will only have the default amount of ammunition for the selected weapon and will lose your previous stock. You will only be able to choose one weapon and will lose the other two special weapons.
We have more cheats and tips for this game here, Dead Space: Extraction cheats
Comments for this cheat