noun, plural M-1's.

a semiautomatic, gas-operated, .30 caliber, clip-fed rifle, with a weight of 8.56 pounds (3.88 kg): the standard U.S. Army rifle in World War II and in the Korean War.

Also called Garand rifle, Garand, M-1 rifle.
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British Dictionary definitions for m-1 rifle

M-1 rifle


a semiautomatic .30 calibre rifle: the basic infantry weapon of the US Army in World War II and the Korean WarAlso called: Garand rifle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012