The M3 Grease Gun's magazine design was driven by its mass-production, low-cost philosophy, mirroring the British Sten gun. Unlike the Thompson's complex T-lug system requiring milled receivers, the M3 used a simpler single-feed magazine compatible with its stamped sheet metal construction. This design choice prioritized manufacturing efficiency over inter-operability with existing Thompson magazines.
The Hyde/Marlin M2 SMG was a rare WWII firearm designed by George Hyde to be more accurate and controllable than the Thompson. Despite superior performance in trials, manufacturing issues with metal sintering and the development of the cheaper M3 Grease Gun led to its cancellation. Only 400 M2s were produced, making it a forgotten rarity in firearm history.
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