DO NOT purchase that set from Canadian Tire, that's $100 completely wasted on a terrible set of spring powered, cheap plastic, pretty much useless and unplayable guns that are worth more like $30 and should just be thrown in the garbage after a week. You will absolutely regret it.
Hold onto that $100, save up a few more twenties for a few more months, and spend $160-$200 on a real airsoft gun.
You can get a decent gas blowback Glock for $160
And a really great for the price SRC M933 AEG for $210
(He's out of stock so get both guns from Ken @ http://www.007airsoft.com/products/htm/aeg-src-m16.htm