As with most things in this world, things that are cheaper are usually cheaper for a good reason. While it may be outwardly (and maybe internally) identical looking, there's a very strong likelyhood it's made of cheaper quality plastic, weaker metal, etc to keep costs down. Certain tolerences (not that airsoft parts are high tolerence to begin with) might be lower, ie. more "variety" making it through whatever passes for QC at the knockoff factory.
You usually get what you pay for, and if the price is too good... yeah.
As for American players stating it's a good "starter gun", bear in mind that the American mentality is a polar opposite from ours. They have easy access to airsoft guns, for cheaper, and it's generally looked at the same way as paintball (ie., start with a low end gun, and play - get better stuff when you're more serious about your game).
Unfortunately that isn't a luxery we have in Canada; if you're gonna pay $300 for this POS - unlike Americans who'll get it for under $100 - you might as well save another $150 and get a used TM AEG.
Cheap guns have always been tempting, specially for people on a tight budget. It would be great being able to get all the gun for half the price. But these cheapo guns never deliver, and you'll wind up wasting funds that would have been better used getting a good gun.
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