Sorry but the OP stated:" I guess you can thread the RGS and use double locknuts but that is more labor intensive."
By "double locknuts we always assume a sheet metal box" WHERE A SET SCREW CONNECTOR WOULD BE CHEAPER THAN THREADING.
And that explosion proof box will still REQUIRE the conduit to be threaded, which the OP wanted to avoid(look up again to the quotes, correct me if I'm wrong)
I don't get what you are 'sorry' about..
From post #1
Is there a 4 11/16 box with hubs that can be used with RGS conduit? Or what would be the equal? I guess you can thread the RGS and use double locknuts but that is more labor intensive. Thanks
What I would like to ask is what option are there for small junction boxes with RGS
There are three questions. 1) "Is there a 4 11/16 box with hubs that can be used with RGS conduit?" The answer is yes, I gave the Killark PN. 2) "Or what would be the equal?" He got many answers to that question long before he got his first question answered correctly.
He then made a statement, "I guess you can thread the RGS and use double locknuts but that is more labor intensive." I read this statement to be one possible answer to question #2.
And finally 3) "What I would like to ask is what option are there for small junction boxes with RGS(?)". The best answer would be stamped and cast. I don't see where the OP asked about explosion proof boxes in the first post. I guess that is one possibility, but I don't see it as being applicable sans a specific request for explosion proof.
"WHERE A SET SCREW CONNECTOR WOULD BE CHEAPER THAN THREADING." Who said that? Set screw connectors would not be cheaper than threading if a threader was available. Even so, the OP asked for available options and did not ask for comparative costs.