Also while you are in the process of purchasing a legal or an illegal firearm, neither side of the party is complaining about the activities that are taking place. The salesman is making a sale, and is content on making his/her business thrive. The buyer is buying a product that he/she is inquiring about. In this case, a firearm and in conclusion no harm is done.
During the purchase of a legal or an illegal firearm, there is no damage being done at that moment. No damage to property nor to any people. Therefore you are not leaving behind a victim.
When you purchase anything, there is no harm being done in any case. For example; you are not harming anyone when you are purchasing a pizza, or purchasing a slurpee at a mini market, or buying you monthly groceries for your home. It is simply a harmless purchase and no damage is being done.
These offenses are not usually listed as victimless crimes because people believe that guns kill people, when in fact people with guns kill people. Some other examples of “victimless crimes” are prostitution, gambling, and purchasing/selling drugs.