They made them about 35 years ago. I’ve held one and it balanced real well, better than a Thompson.
16 inch barrel, stock. metal hand guard.
Full Auto?
16" barrel sounds more like an effort to produce a look alike pistol that is not a class III machine gun and therefore does not require a BATFE Form 4 or a $200 tax stamp.
I seen quite a few "ugly" guns that were made to fill the desire of some to have a fake "machine pistol".
Regards,
GtG