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The muzzle brakes were introduced in 1942 after a "super" cartridge was introduced towards the end of that year.
The "super" raised the muzzle velocity considerably, so the muzzle brakes were retrofitted, mainly from 1943 on...
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As an aside, it was known as the G1 in South Africa where post-war it was modified to 90mm and manufactured locally with some mods.
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The SD40 is 55 now!
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