This comparison highlights the M3 Grease Gun's cost-effective, simple design versus the Thompson M1A1's classic status and higher fire rate. Both firearms are chambered in .45 ACP. The M3 features a unique dust cover safety and a stock with a built-in magazine loader, while the M1A1 is heavier with a fixed stock. The speaker prefers the 1928 A1 Thompson variant for its removable stock.
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