C3 105mm howitzer
The C3 105mm howitzer. This is an ancient design that actually dates back to the Second World War. Not exactly field grade these days; supplanted by the LG 1 Mk II 105mm howitzer and the much newer M777 155mm howitzer.
A corporal from 7 RCA (Toronto) Regt told me that they use the C3 for saluting these days. There is supposed to be a gun salute at Queen's Park on Wednesday, September 5th at 1pm. Don't take that time as gospel, though. I'm trying to confirm the specifics.