Mine is an old Cobray that I have had for about 20 years. The PM11 was not well received because of quality issues during certain runs. I got a good one luckily. Do need to put in a threaded barrel and possibly a side cocker with rail on the upper receiver.
The non SMG Macs are only in need of some filing to be full auto. Very easy. Seen it done and the part is simple to swap out to keep it unmodified unless needed as a bullet hose.