There is currently much speculation regarding why the T97 rifles were "deemed prohibited, and the matter has been discussed at lenght on another board.

What is so far, which comes directly from the first company to attempt to import a large shipment of these rifles (this company, as well as another one succesfully imported small sample batches prior to the aforementioned large shipment).

Upon landing in the country the RCMP grabbed a "sample" from the shipment and took it appart, at which point they noticed some "unusual" tool/file/cutting marks, which gave them an excuse to declare those "converted automatics".

Why the previously imported rifles were subsequently declared "prohibited" also is not confirmed at this time.