The Rustsatz field modifications allowed for guns or other equipment to be fitted to standardised location points present on all aircraft from the G onwards. Therefore the extra 20mm cannon could be removed in the field, but without them the standard G6 armament of 1 20mm cannon and 2 13mm MGs lacked punch against bombers.
Normal solution was to have some 109s without extra armament escorting the more heavily armed bomber destroyers. Other solutions were to use Bf109s fitted with a 30mm engine mounted cannon as a permanent modification, or another Rustsatz kit with 2 30mm cannon fitted instead of the optional 20mm cannon, but these were late introductions and the 30mm Mk108 had too slow a fire rate and too low a muzzle velocity for effective use against fighters.
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