Some of the aircraft guns used as defensive were 7.9mm, so yes is possible LB
https://en.wikipedia.org/wiki/List_o...g_World_War_II
The Messerschmitt Bf-110G was a very successful night fighter. With a top speed of 342 mph and a maximum ceiling of 26,000 feet, it could easily get among a formation of bombers. Equipped with 2 x 30mm and 2 x 20mm cannon with a 7.9mm machine gun, it also carried a formidable weapons load.
https://www.historylearningsite.co.u...ight-fighters/