was found to be prone to jamming, and if fired at night the muzzle flash tended to temporarily blind the pilot's night vision. According to the account of the engagements against the USAAF by II./ZG 26 from late February through mid-April 1944, the 53 Me 410 Hornisse of that Zerstörergruppe equipped with the BK 5 claimed a total of 129 B-17 Flying Fortress and four Consolidated B-24 Liberator heavy bombers, destroyed over five or six interceptions while losing nine of their own Me 410s. See also BK 3,7 BK 7,5 MK 112 cannon Vickers "S" gun QF 6pdr Class M Mark I with Auto Loader Mk III (6pdr Molins gun) Nudelman-Suranov NS-45 Notes References . Aircraft artillery Autocannon 50 mm artillery Weapons and ammunition introduced in 1943