In Manitoba, the RCMP have typically been notified ahead of time whenever there is a large OP in a rural area.
I have never seen or heard of an RCMP Officer arresting or seizing any gear/guns at all. As a matter of fact, a few payed a visit to an OP I was at once just to check it out. I can't for the life of me remember which one... I'm sure one of you Manitoban Airsofters can help me out.