The CIA's Deer Gun, a successor to the WWII Liberator, was designed as a cheap, disposable covert weapon. Made from cast aluminum and chambered in 9mm, it featured a manual loading process and a hollow grip for ammunition. Despite high initial tooling costs making it expensive per unit, its primary value was deniability, with only 1,000 units produced and most likely destroyed.
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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