The primary user of the A7 was the Wehrmacht during World War II where the weapon went by the name 3.7 cm Kampfwagenkanone 38(t).

In German service, in addition to conventional high explosive ammunition, the weapon fired two anti-tank rounds.

The rarer tungsten Panzergranate 40 armor-piercing composite rigid (APCR), was ineffective at 1,000 m (1,100 yd) and beyond.

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