For purposes of the Gun Control Act, a person is not considered convicted if he or she (1) has been pardoned, (2)
had his or her civil rights restored or set aside. . .
http://www.cga.ct.gov/2008/rpt/2008-R-0617.htm
(ii) A person shall not be considered to have been convicted of such an offense for purposes of this chapter if the conviction has been expunged or set aside, or is an offense for which the person has been pardoned
or has had civil rights restored (if the law of the applicable jurisdiction provides for the loss of civil rights under such an offense) unless the pardon, expungement, or restoration of civil rights expressly provides that the person may not ship, transport, possess, or receive firearms.
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Gun Control Act