There is no such thing as any gun license. There is only a license needed to conceal a pistol on your person.
You will need to be a U.S. Citizens, Immigrant Green Card Holders, or have a valid WA State issued Drivers License or I.D. card. This is state law. You also must join as a member after filling out a waiver online. At the lowest level of membership you will need to bring a friend or a firearm in order to shoot at the range.
Yes, you will just need to fill out some paperwork when you get there. Be sure to bring a valid ID.
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