Finch is the most popular I think.
There is a field near Canada's Wonderland called Black Site, but I think it's private. I only know of it because there was an event posting here on ASC a little while ago. Don't know if they're still active or allow public members in.
Primary: Custom ZTW VFC AR - Custom RTW VFC AR - KJW KC02
Secondary: Custom TM PX4 - KJW Mk1 - KJW M9
Camo: Pencott Greenzone - Multicam - Ranger Green - MARPAT