Lee informed me back when I bought my TL that the stars were and indication of some sort of factory work after the original sale, but not necessarily new parts. It could have been applied for a re-finish as well, as was the case with my TL.

My TL has the star in several places- the grip frame on the left side at the bottom towards the front next to the date of re-finish stamp (362), and inside the ejector rod housing as well as on the cylinder under the extractor star.