Well, it appears that they have put a "Canadian" model number on it- but the standard US Version was indicated to max-out 495fps- so I don't know if it in fact has been modified or not. If it has, it will be a bleed in the valve (it's what they've done on all the other detuned pumpers in the past). They "blister pack these and the 1377's so I have not opened one up as of yet.