You will have to call the maker to find out what it means.
You will have to call Ruger to find out.
returned for repair is most likely
The asterisk before the serial number on a 1963 $5 bill indicates that it is part of a replacement note, also known as a "star note." These notes are issued to replace misprinted or damaged currency, and the asterisk serves to distinguish them from regular notes. Star notes are often collected by numismatists due to their rarity and uniqueness.
See the BEP page at Related Links, below
That's called a star note. The star at the end of the serial number indicates that the original bill was damaged during printing and was then replaced.
See the BEP page at Related Links, below
The value of the bill is close to $40 each. The exact amount you can expect will vary depending upon its condition.
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This indicates a problem in the printing. The original bill was destroyed, and the replacement was given the same serial number, with the asterisk (star). They're somewhat rare, but they're only worth face value, because there's really no demand for them.
The asterisk, or "star."
Asterisk
That is an asterisk.