Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Start Windows Explorer and enter the game folder. Highlight the "guns.ini" file and press the Right Mouse Button. Uncheck the "Read Only" box under "File Properties". Use a text editor to edit the "guns.ini" file. Change the spin velocity, muzzle velocity, shots per second, reload quantity, air, auto, and scope of any of the guns as desired. To make a weapon fully automatic, replace "0" with "1" on the "auto" entry. Note: Grenades and the auto-setting are mutually exclusive. Both cannot be enabled on the same weapon at the same time.