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Mk. I (Practice)
The Mk. I was a fixed, pre-WW2, US, 37 mm, inert, practice cannon round, which emulated the Mk. I low explosive (LE) round. The Mk. I practice round was comprised of an inert fuzed and inert practice projectile and a cased propellant charge that used the 37×93R case (R = Rimmed) cartridge case. The Mk. I was used by the 37 mm Model 1916 (M1916) light support gun and could also be used by its external (M1, M2, M4, M5, M7, M8, M9, M10, M13A1,...
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