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It means "Model 1" "Addition 1"

The standard M1 carbine has the standard solid wooden rifle stock, while the M1A1 is the modified "paratrooper" model with the folding metal wire stocks, these versions of the carbine were used in Europe.

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13y ago
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14y ago

M1 stands for first motorway (M) motorway (1) first.

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Q: What does m1a1 stand for?
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