Yes, it's a Scott Werks gangster kit. Scott retired a couple years ago and they're hard to find these days. The guys that make the short, finned barrels won't sell you one without a SBR stamp. That's a fake drum but I have some GSR drums and 50 round sticks. PAXThe Thompson is a .22lr?
I know they're worth banks these days, but the paltry sum I got for it back in '68 went towards a 20 ga 1100, which turned into a 3 screw 7" Ruger .41 mag. PAXIf you still have that 44 US, it is worth WELL over the $5 !!!