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Why do you want 450? That's way above any field limits for automatic AEG's in Canada.
The $180 one is pre-shimmed... so you can't fuck up the shimming... I generally choose modify parts over guarder, in my experiences Modify is made much better (And more recently too... some guarder kits have been on shelves for over 5 years)
Shimming is one of the most important parts.. If you screw that up, you can kiss your gears goodbye.
Not to mention the 85 dollar one is in HK, and in US dollars.. So it's 110 + shipping... So you're really only looking at a 20-40 price difference.
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