1.
BTC transfers related to firearms on the standard US regulated exchanges are not allowed. Please be aware of this before you purchase BTC from coinbase or circle.
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https://www.circle.com/en/legal/us-user-agreement "18. Prohibited items... ...weapons of any kind, including but not limited to
firearms, ammunition, knives, or related accessories..."
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https://www.coinbase.com/legal/user_agreement?locale=en "Regulated Products and Services... age restricted goods or services;
weapons and munitions; gunpowder and other explosives..."
Note that this is not a law it's a rule from coinbase, circle, and bitpay. Annoying really. I helped a gun shop in my city to set up a bitpay account only to find bitpay scrambling to add a ban to their website and cutting off their account. Not very professional at all. There is no reason to fear firearms sales they are the most documented and supervised sales you will find.