Persons convicted of a disabling offense may seek to have their firearms rights restored by means other than a federal relief from firearms disabilities pursuant to 18 U.S.C. § 925(c).  Other means of restoring firearms rights include:

A person convicted of a federal offense may apply for a presidential pardon. 28 CFR Part I specifies the rules governing petitions for obtaining presidential pardons. You may contact the Pardon Attorney’s Office at the U.S. Department of Justice to inquire about the procedures for obtaining a presidential pardon. 

A person convicted of a state offense may contact the State Attorney General’s Office in the state of their conviction for information concerning the availability of expungements, set asides, pardons and civil rights restoration.

Any pardon, expungement, set aside, or restoration of civil rights must completely remove the effects of a prior conviction, including any restrictions on the shipment, transportation, receipt, and possession of firearms, for firearms rights under federal law to be restored.