Garand Thumb (1/1/2019) has the earlier version. Ian & Karl (2/13/2019) are reviewing the updated version, the earlier version doesn't have the little window on the side of the handguard, just aft of the 4 slanted handguard cooling slots, that lets you see the gas port setting. 12:24 in Ian & Karls video.
I wonder if they're going to provide updated parts replacement for all MDR's sold sofar, free of charge. they ought to. JMHO.
I have neither, and probably never will, but I'm intrigued by the compact design, bullpups in general. sucks to be on the bleeding edge of technology. will have to see.