Can you post a picture of your pistol? Or give me the 3 letter date code and the serial number with X's for the last two digits?
The M9A1 and M40A1 pistols that I have seen in Canada all have a loaded chamber indicator which is basically a long, spring-loaded, rod that runs from the breachface to the back of the slide. On the breachface side it looks like a little cone that sticks out (see below). When a round is chambered it causes a little protrusion to stick out the back of the slide that the shooter can see and feel.
This is on the 2004-2008 models of the M9A1 and M40A1 pistols. This part can be removed, but there will still be a hole in the breach face and hole in the back of the slide.
1999-2003 = Steyr M pistols
2004-2008 = Steyr MA1 pistols
2010-present = redesigned MA1 pistols
The new pistols have a totally different serial number range. The new ones have a 7 digit serial number starting with a 2 or a 3. The old (2004-2008) ones have a 5 digit number, probably starting with a 0. The new ones all have "W" as the middle letter in the three letter date code. The old A1's all have "O" as the middle letter.
The redesigned ones, from what I understand, have ditched the loaded chamber indicator. They also have a redesigned trigger and extractor, and I believe the grip is a bit different as well. To my knowledge, these newer 7-digit serial number guns have not been imported to Canada as of yet. If you have one, let know. A redesigned gun will also have a left-to-right rollpin beneath the rear sight.
The other possibility is that maybe you have one of the old 1999-2003 "M" guns. They are a different colour. Sort of blue/black instead of gray.