You are correct--the CT barrel roll mark was used in NY for awhile after the move. And you are right that this rifle in the post has a MR receiver--never heard about this before--those bad barrels had to make their way up to NY. I remember Express rifle production being halted by Remlin until QA/QC issues were corrected (mostly concerning droop and fit issues)--the 338MX/MXLR was cancelled altogether. My Remlin 308MX doesn't have the fit issues/tool marks/sharp edges/bad bluing/mis-aligned sights found on a lot of the 2010-2011 era manufactured Remlin rifles. There are a few Remlin rifles made during 2010-2012 like this as well. I will never know for sure--but I think my Remlin has a majority of CT parts in it. I haven't seen a Remlin as nice as my Remlin 308MX in my LGSs since purchasing it in early 2012.Well, I am just clarifying, initially you stated that MR receivers didn't have droop issues, as you can see that is not the case, MR receivers did have droop issues, if I'm not mistaken, I believe that all MR receivers were made in Ilion NY, there were some Marlin made barrels that had North Haven roll marks that were sent to Ilion but all the Marlin made receivers that were sent already had the 91 serial numbers on them, hence the reason you have 2009 and 2010 manufactured rifles with 91 serial numbers.
Remington was allowed to use the North Haven roll mark on Remington made barrels for quite some time after the move to Ilion, so that would explain why some rifles have the North Haven roll marked barrel and MR receivers, if your North Haven roll marked Barrel has the REP proof mark, it was assembled in Ilion, and is possibly made with 100% Remington parts, just an FYI.