While you are on the site, in your browser find and click "Add to Home Screen" A CGN beaver app icon will then be created to your phone that is directly link to the site.
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They were and probably are available in Canada. I think Wolverine had one recently. And no, I think they were all grey, but I had one and I did the fabric dye thing on my gas barbeque and it worked awesome!
Available now from HK in Black which makes the conversion better. www.HDPS.com is the place for the parts but you'll have to get permits for some stuff to bring it in. You can get a stock block and a new stock but they are some what hard to find and then depending on what you do you either have to keep your USC lower or mill it out for UMP mags.
Go read around on www.hkpro.com for som info about conversions.