Several weapons had the designation of M1. Assuming the question was referring to one of the most prominent weapons to fall under that designation:
The M1 Garand has a length of 43.6 inches (1107.4mm).
The M1 carbine has a length of 35.6 inches (900mm).
The Thompson M1 and M1A1 have a length of 32 inches (819mm).
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