I'm pretty sure many people would have done this, myself included, if the factory barrel length exceeded 106mm. At this point, HK does not make a threaded barrel for this gun yet, so the alternative is an aftermarket barrel that exceeds 106mm. Irunguns were able to get their hands on some of aftermarket threaded barrels and install them on these pistols so they could sell to Canadian market. At this point, all civilian sfp9/vp9 in Canada have only these aftermarket threaded barrels, all sold through Irunguns. Not sure on the quality of said barrels but I'd prefer to have a factory HK barrel.
It's like comparing lone wolf Glock 19 barrel to a factory Glock 19 barrel.