Mine are the hex receivers which were purchased from J&G. There's not a whole lot of info on their website as to origin, etc. But I've done business with them before so I'm reasonably sure I'll be pleased.
Thanks again. I'll look that guy up when I get there.
JG sales are very good to deal with. The hex receivers are pre 1935, so you will get one that has been thru WWII and maybe you will get a bit of a rare one. Luck of the draw.