Well it looks as though the R51 ship has sailed.  I had a friend of mine inquire about threaded barrels at the SHOT Show and was told that the R51 had been discontinued. It's not in the 2019 catalog either.  The last nail in the coffin was when I was searching for cheap R51's on Gunbroker, I ran across a dealer who has over 6000 of them in on hand, which pretty well indicates that he bought Remington's entire stock.  The good thing is he's selling them for $227 each!!!!!  Here's a link: https://www.gunbroker.com/item/797745264

I'm so pissed at Remington for screwing this up.  If they wouldn't have jumped the gun to hurry production for SHOT 2014 this fine firearm would still be in production with maybe a 45 cal version on the horizon.  But Nooooooooooo, they had to F*ck it up.

BTW I've got one of DangerCo's threaded barrels and my R51 suppresses quite nicely in deed!