JUST GOT OFF THE PHONE with a RCMP Firearms tech.

"Absolutely not, the crosman m4-117 modded to go over 500fps would be a NON-restricted Firearm"
The logic here is any firearm that resembles an AR doesn't become restricted because of design features that make it LOOK like one. It would have to be built as an operating AR-15, gas line, etc...

BAM