The Apache Arms carbine was a Thompson SMG lookalike that was made in small numbers in the late 1960s. It was the successor to the Spitfire carbine made by the same people, after the Spitfire was deemed a machine gun by the IRS. The Apache used M3 Grease Gun magazines and was chambered for .45 ACP. It uses a square receiver tube and many of the same cast parts as the Spitfire. It is a very interesting look at how the design was adapted to be legally considered semiautomatic.
Spitfire Carbine video: https://youtu.be/GHJ7OHzlFGg
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