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Mine shoots about 430 fps stock, so no, it can't be fielded stock in Canada. A spring downgrade is definitely required. Metal bushings and a shim job would probably be recommended too, but if you put in a 340 fps spring or less, you may be able to get away with the plastic bushings. and stock shim job. But for the price of the shims snf bushings, if you already have the mechbox open, you might as well swap 'em out and shim it.
I know I'd have no qualms about fielding my totally stock JG MP5 shooting at 340-ish fps.
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