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M58 Practice (Base-Initiating Fuze)
The M58 practice is a non-delay base-initiating fuze that is used with the M63 Mod 1 base-fuzed 37 mm low-explosive practice round. The M63 Mod 1 practice round was used with the 37 mm Model 1916 (M1916) light support gun and its external (M1, M2, M4, M5, M7, M8, M9, M10, M13A1, M16 mountings) and internal (M12, M13, M14, M15 (T34), M1916A1 and T36) subcalibre variants, which used the 37×93R case. The M58 is a modified version of the M58 fu...
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