A German document captured in the Middle East states that the standard demolition
charge for the 20-mm dual-purpose guns (models 30 and 38) consists of 20 special cartridges
placed on the magazine feedway and plugged by means of sandbags. These cartridges
contain a 3 1/2-ounce picric or TNT charge. The whole charge is fired by two
standard "short" demolition sets, each consisting of a detonator and holder, 3 feet 3 inches
of safety fuze, an igniter adapter, and an igniter. These demolition sets have a delay
of 100 seconds. The two igniters are fired simultaneously.
Double ignition is provided in order to lessen the chances of a misfire.