The BF109 Gun Sound is the sound of 13 mm caliber MG131 Twinned Pair Firing from Messerschmitt Bf109. Rheinmetall-Borsig developed it in 1938 and produced from 1940 to 1945. The MG131 used at fixed, flexible or turreted, single or twin mountings in Luftwaffe aircraft during World War II. Many aircraft such as the Messerschmitt Bf 109, Me 410 Hornisse, Fw 190, Ju 88, Junkers Ju 388, He 177 used these guns during WWII.

The BF109 Gun Sound consists of the looped audio file 10 seconds long and the ending file, which should be played at the end of the shooting. The WW2 Weapons SFX Library library includes 28 audio files.