I emailed guncrafter and here is the response I got.
Dear John,
This is a brand new item, you can find pictures/info on our website
w ww.guncrafterindustries.com We will start shipping in about 3 months, cost is $595.00.
We are taking orders on a first come first serve basis. A $200 deposit is required per unit. We will contact you shortly before shipping at which time the remainder is due.
Here's some general info:
The 50 GI conversion unit will fit Glock pistols 20/21.
The unit consists of a complete top end and a magazine, simple drop-in installation on user's Glock frame.
Capacity is 9+1 with extended base pad, 8+1 with standard base pad.
Slide and barrel machined from stainless steel forgings.
As is typical of all Guncrafter Industries' products, very high quality machining to tight tolerances.
Easily controllable, with .50 cal. stopping power.
50 GI factory ammunition available from Guncrafter Industries, as well as 50 GI brass, bullets and reloading dies.
This is a conversion unit, not a complete firearm. Therefore, no FFL is needed and it can be shipped directly to the user.
Shipping cost to Canada for one unit is approx. $15, with one set of dies enclosed the shipping would be about $18.
Would need to know how many cases you want to quote shipping....
Will get a catalog in the mail for you.
Best Wishes,
Alex Zimmermann
So it looks like the RCMP won't have to be involved in classifying it or whatever it is they do. I'm not sure about export from the States though. I would imagine because of the cost it's something the State Dept would have to approve with proper import papers. I'll send off another email and ask them specifically about that.