This program is designed to change the characteristics of the weapon. You can do bits of Bazooka and the Bazooka gun Glock. Looking like your fantasy works. By the way, from fashion to pistols and flares, etc.
To edit, click Load, go to the "Grand Theft Auto 4/common/data/" and select the file WeaponInfo.XML. Next, the program will open the characteristics of each weapon in the game.