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There is also the "Just Right Carbine" if you're into AR styling, or the TNW Aero Survivor, H&K semi versions of their submachine guns, plus clones of them, and the Beretta CX4 Storm. Mech Tech makes carbine "uppers" where you attach the lower frame assembly from your pistol, but I don't think they have one yet for SIGs. The H&R Reising Model 60 might be another more traditionally styled option (looks more like the Marlin Camp Carbine), but all I've found are pretty expensive collectibles.
There's also an outfit in Texas that converts Marlin lever actions for auto pistol calibers, and of course nothing is impossible if ya got the cash for a full blown custom piece.
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