One sold on ebay a couple of years ago... I know a day late and a dollar short on the comment... but I have been doing other things... did not know so many of them were around.
Neat vid, love the tools and special jigs for doing the things we no longer see as a rule. Staking the two swivel screws for instance, done in a second. Screwing in the gas cylinder lock screw...setting the gas cylinder. All those parts were tight as a drum. Screwing in the barrel, I see how that tool works now...