Well that must make it true then...
Sorry for the sarcasm but honestly I'm not "insisting" on anything... merely saying that making such statements without some offer of proof or evidence to support the statement is rather lame.
THR is not different than Gunnutz, AR.com or many other user forums... a lot of the posting are very questionable and often quite inaccurate. Just because "so and so" said something doesn't make it true. I have personall worked with, sold, handled, etc. 100's of RRA units and my personal experience DOES NOT support the statement you made... so I have to ask on what FACTS you make your statement. You now say that you were repeating something you read elsewhere... but who knows what actual fact or evidence there was for those statements?
There are a lot of RRA users here in Canada who own the guns and they have NOT experienced the "fit" problems you suggested... not to say that someone didn't find a tighter fit here or there... but not what you suggested. Before you make such a statement you should be very sure that it is in fact correct... sounds like all you did was read something and repeat what you read... if the information was not correct then what value is your statement?
Mark