Just to throw my less experienced and informed :2c:
Reading berub's post a little closer, by "seeing some action" he is looking to take the fight directly to the enemy, a la the Infantry. He does indicate that his first choice of trade was Infantry, and subsequently chose Weapons Tech because Infantry was closed. Judging from his questions, he is asking if he may get some direct combat experience.
Your desire to want to get combat experience is commendable, but unlikely to be fulfilled for two reasons:
First, As a combat support trade you will most likely be deployed either on base or in a static support location, and won't be out patrolling. If you are put on a mobile repair team you would be sent out to do repairs in the field, but wouldn't be deployed while shooting is still going on.
Second and more importantly, is you should be aware, Canada's combat mission in Afghanistan is winding down and will be done by the time you are qualified as a weapons tech. So no, you won't be seeing action anytime soon.
However don't let that discourage you from the path you have chosen. You will go into the field. You will train and apply your trade on field exercises. You will get to work on the various weapons and equipment used in the CF. And you can have a good time doing it. It will be what you make of it.