Fine, let's discuss.
He was at the Brandon show in December, brought a bunch of stuff. It was hard to get close to the table most of the time. From what I saw, at that time he was showing repros of WW2 Mark IIs and Mark IIIs but he also had one there that seemed to be about half-and-half.
As to semi-auto MGs, I was the guy who first got the legal approval to have the things, back in 1978, from the Attorney-General of Newfoundland and Labrador. The ruling was that if the conversion rendered a full-auto into a semi-auto, the firearm in question BECAME a semi-auto. I also detailed several ways this could be done, including the manufacture of a new bolt which did not have the clearance cut for the change switch. Put this bolt into a FA Sten (or other gun of similar, that is, open-bolt-firing, selective-fire with tripping lever type) and you have a strict semi-auto which will not fire full-auto.
As I said, this conversion was approved by the Attorney-general of a Canadian Province, in 1978. That is what started the whole CA thing, along with Trudeau and his lackeys banning the terrifying FA firearms (which have never been used in the commission of v a violent crime in Canada, at least since 1934).
Likely the RCMP were able to fire a SA Sten in FA condition by switching-in a Government bolt..... which HAS the cut to make it full-auto..... for the strict semi-auto bolt that was in it.
As built, the actual Sten design is inherently semi-automatic in operation: the simplest way to build one, using all the parts, is as a strict semi-auto. It THEN may be ALTERED to produce full-automatic fire. But leave it alone and you have a strict semi-auto.
It is exactly the same situation as a GEVARM, which was popular for conversion to FA when I was in school. Lotta rabbits ended their days in front of a .22 MG which had a cyclic of around 1500 rpm.
The quibbling begins when lawyer words are introduced. The police will prohibit something if they think it is "easily converted" to Prohib status..... but there is NO definition of what "easily" means. A friend once offered to convert the rear axle from my '54 Buick into a machine-gun' all he asked was 2 days, a lathe and a milling machine. For HIM, that was "easy"; for ME, it was incomprehensible that any person could be that talented. But he was serious.
Just be very, very careful... and be sure to have fun!