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 Marlin UD-42, also known as the 'Avenger', was a 9mm SMG used by resistance forces in WWII Europe. It featured a unique vertical front grip and a high rate of fire, with an innovative 40-round double magazine. Despite not being adopted by the US military, it's a significant historical firearm, with this example heading to auction.
The Marlin/United Defense UD-42 is a 9mm open-bolt submachine gun designed by Gus Swebilius. Initially ordered by the Dutch government, production delays meant the 15,000 units were instead supplied to the OSS and SOE for European resistance groups. It features a high rate of fire, Thompson-style magazine locks, and a simple blowback action.
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