Sten kits are easy to build into legal semi autos without the need for a lathe. There are tons of resources online, including how to tell a good kit from a PITA to rebuild kit. You can even do one that fits on an AR lower, or make a vertical mag well like an MP 3008 or a S&W 76 look-alike. IMA even has side folder stocks. The Sten has unlimited possibilities.
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