M1 Thompson

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The Thompson was mass-produced during World War II and became an instant favorite among soldiers due to its unwavering reliability. However, the manufacturing costs were excessively high, making it impractical for large-scale production. Consequently, the military opted for the M3A1, also known as the Grease Gun, which emerged in 1944. Despite its later arrival, the Thompson remained a trusted sidearm, but the Grease Gun eventually took over due to its earlier introduction.