I would imagine a 1X8, 1X7.5,or a 1X7 would also work, not just a 1X9, for the SSS 60 grain cartridge.
No the Nordic unit isn't made with a 1X9 so no they are not worth having for any reason, so you are absolutely right, no one make a usefull dedicated upper.
There are several Folding stocks that are available for the AR style lowers, usually in conjunction with someones piston system and of these I like the Para-Ordanance the best, strongest and sturdiest, and their piston gun comes in a 1X9. Perhapse you could get a new carrier for your upper, clean out all the lead that you weren't worried about and sell it off, get the Para and put you conversion in it and you would be all set. I did notice that the Para upper is on sale right now but I can't remember where. Maybe someone else that saw them could chime in and tell you where to get them. KurtM
No the Nordic unit isn't made with a 1X9 so no they are not worth having for any reason, so you are absolutely right, no one make a usefull dedicated upper.
There are several Folding stocks that are available for the AR style lowers, usually in conjunction with someones piston system and of these I like the Para-Ordanance the best, strongest and sturdiest, and their piston gun comes in a 1X9. Perhapse you could get a new carrier for your upper, clean out all the lead that you weren't worried about and sell it off, get the Para and put you conversion in it and you would be all set. I did notice that the Para upper is on sale right now but I can't remember where. Maybe someone else that saw them could chime in and tell you where to get them. KurtM