I had a pretty quick response from the lab when I asked about this rifle.
Here is the response I got on July 24th. Not too much in the way of useful info but at least it is on their radar:
The legal classification of the Beretta Model ARX100 is not known at this time. This firearm is the semiautomatic version of the Beretta ARX160 full automatic assault rifle. A sample is presently under inspection to confirm the legal classification.
Semiautomatic versions of automatic firearm requires physical inspection before a legal classification is assigned. All opinions concerning the classification of firearm recorded in the Firearms Reference Table (FRT) database are very carefully considered, take into account all information available at the time and a founded entirely on the classification provisions in the Criminal Code and supporting regulations as enacted by parliament.
The time it takes to complete assessments of firearms depends on the complexity of the firearm, the thoroughness and clarity of the manufacturer's data package and the quantity of work on hand.
Hope this help
Daniel Guay
Senior Firearm Technician / Technicien en armes à feu, Senior
Firearm Technology Unit, Supervisor/ Superviseur du Groupe de la technologie des armes à feu
Royal Canadian Mounted Police / Gendarmerie royale du Canada
Canadian Firearms Program / Programme canadien des armes à feu