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If your friend was convicted of a felony, he may not legally own or possess any firearm.
If it was the type of felony that could have been charged as a misdemeanor, he may petition the court that convicted him to reduce the conviction to misdemeanor, then he may own a firearm. If it was not the type that could be charged as a misdemeanor, then his own option is to petition the governor for a pardon.
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