The US Navy converted M1 Garands to 7.62mm NATO as the Mk2 Mod1 due to reluctance to fund new M14 rifles. Early Mk2 Mod0 conversions using chamber plugs failed, leading to the Mk2 Mod1's adoption of new 7.62mm barrels. These conversions required opening the gas port and adding a magazine spacer to prevent .30-06 loading. Authentic Mk2 Mod1 rifles can be identified by specific barrel markings and are best verified with CMP documentation.
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