No person, other than the owner or possessor of a firearm, may accept any firearm for repair without having first been shown a valid identification card showing the person delivering thefirearm to such person accepting it for repair to be eligible to possess the firearm in question. No firearm shall be returned to any person after repair or other work done on it without the repairer having seen the identification card of the one to whom the firearm is to be given.

SOURCE: GC § 8905.2.