Either will work, but it is far more likely that it would be by hand with a needle. Professional peircers frown on using guns and most (boutique) shops that use guns will not pierce noses - or anything except for your ear. Dont try it yourself or let a friend do it - its not worth the risk of infection.
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A gun maybe... But both of them hurt. I would never want to pierce any part of my body.....
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