The major reason is to protect the sport. The difference between paintball and airsoft is our guns can much more easily be confused by Law Enforcement as a real firearm. The reason for the 18+ rule is that when your 18 your legally responsible for your own actions and under the eyes of the law are supposed to be mature enough to handle the responsibility of owning a firearm/replica.
Airsoft is in a much more grey area of the law then paintball is. The basic idea is we are trying to protect the sport we love and have spend thousands of dollars on. Ever hear of SB798? All that started when a 13 yr old challeneged Police with a fake gun and was shot to death as a result. We dont want here.
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