Armmalite did a 5K or so run of what they called the AR-10B back a ways about 10 years or so. It was right after they became Armalite inc after Westrom purchased the company.
It was a reproduction of the original AR-10 with cocking handle under the carry handle sight etc with brown retro furniture and the works.
It was a semi auto only production lower specific to the run and had an A2 brown grip and an A2 style fixed upper carry handle with no Bayonet lug on the gas block.
Don't know if any made it into the country. I doubt it, although when I was chasing this dragon a few years back, I got some wierd message from a guy on here who sent me the name of another guy on the forum who apparently had one in Canada. I messaged him and got no reply.....
Too bad. They are not based on the AR15 design as they predate them considerably, the original AR10 design lower would not fit any AR15 upper or vice versa, the bolt system/cocking handle distinguishes it as a seperate design from the AR15 altogether etc etc
If they did produce them again and someone actually attempted to get it an FRT and have it go through the meat grinder of non logical firearms classification at RCMP however, I would bet every penny in my investments that it would get classified at the very best an AR15 "variant" and restricted or just register it as AR10B restricted on its own.
Fack I hate our gun laws........
Also a fun tidbit here, the original AR10 design actually had the gas tube running along the side of the barrel vice over the top of the barrel as it is now in the AR15 design. The first production ones ran along the side of the barrel and connected into the left side of the receiver just behind the delta ring/rear handgaurd ring. The gas blew into the bolt carrier from here and cycled the action. They later changed it to over the top of the barrel after problems arose in trials.
The more you know!