Guns free! GUN Sounds, Ringtones, and Sound Grenade. This app contains high quality gun sound effects. Shotguns, pistols, machine guns, rifles, UZIs, M60, AR15, MP5, AK47, 357 Magnum. Press and hold for ringtone options! This is the Only Gun sound board with sound grenade functionality! GUNS Free Sound Grenade Instructions: 1] Turn up phone volume. 2] Set timer.