Cr600 barrel

[JayDee24ca]

I'm looking for a shop or someone (here in Canada) that can modify a Crosman .22 barrel for me, to fit a Crosman 600. Any suggestions as to where I can have this done? I'd like to get it 7.5 inches long, with a threaded end, and the leade appropriate to the 600 feed. I'd get it done in the US but the border folks here take a dim view of anything that is pellet gun related.
Thanks