The ZB37 was a Czechoslovakian super-heavy machine gun developed by Václav Holek, evolving from earlier designs like the ZB50 and ZB35. It featured a unique dual rate of fire, adjustable from 500 to 700 rpm, and a robust, expensive receiver machined from a single steel billet. Adopted by the Czech military and later by the German SS as the MG37(t), its design was also licensed by the British as the BESA for tank use.
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