We've made a handful of them now, and they seem to be well received. Dustin's been bringing a couple to the CHAS 3 gun matches each month.
If you're interested in one, send an email to info@albertatacticalrifle.com, I'm not sure that it's an item we will ever really keep a large quantity on the shelf though.
A barrel blank has almost limitless potential to fit any rifle as long as you can machine it... a finished barrel fits only one rifle.