The RSV claim to older, more reliable mss is simply it's way of adopting the more modern critical eclectic text available when it was translated. I'm not sure what NA or UBS versions that may have been. In any event, what is called the Critical (or eclectic) text is what underlies the modern translations (such as NASB, NIV, and ESV) versus the Textus Receptus which underlies the KJV and NKJV.

The current critical Greek NT Text (I believe) is the Nestle-Aland 27th edition and the United Bible Society 4th edition, which are virtually identical.

Sorry, I posted without seeing Dennis' response (above)

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Jim
1689 LBCF
Independent Bible Church
North Texas, USA