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I recall reading years ago-forget where-that until 1936 or so, the practice was M-for Model-followed by the year of adoption-M1888 Rifle, M1892, M1896, M1903, M1911, M1917, M1928 pack, etc. After 1936, it was M and numerical designation. A for minor variation-M1911A1, e.g. E for Experimental.
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