I had a quick read of the RCMP briefing note to the minister of public Safety regarding the SSD BD38 (Props to the NFA for posting)
http://nfa.ca/sites/default/files/RC...sification.pdf
The claims are that the BD38 failed two ways. They claim that original MP38 parts could be installed on the BD38 converting the gun to full auto. They also claim that the firearm could be converted to full auto easily with wire and small bits of metal.
I've looked one of the VZ civillian recievers, and I've looked at a video of a military VZ 58 where the full auto sear and reciever were still completely intact. There's no way the parts could be simply dropped into the civillian VZ I looked at.
If it comes down to it, there's a case to be made here that these aren't easily convertible to full auto.