Possession of firearms by persons previously convicted of crime.
(1)A person who has been sentenced [F1to custody for life or] to preventive detention, or to imprisonment or to corrective training for a term of three years or more [F1or to youth custody [F2or detention in a young offender institution] for such a term], or who has been sentenced be detained for such a term in a young offenders institution in Scotland, shall not at any time have a firearm or ammunition in his possession.
(2)A person who has been sentenced . . . F3 to imprisonment for a term of three months or more but less than three years [F4or to youth custody [F5or detention in a young offender institution] for such a term], or who has been sentenced to be detained for such a term in a detention centre or in a young offenders institution in Scotland [F6or who has been subject to a secure training order [F7or a detention and training order]], shall not at any time before the expiration of the period of five years from the date of his release have a firearm or ammunition in his possession.