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To contract HIV or any other disease transmitted by body fluids there will have to be contact between the infected fluid and the site of the piercing.
Since the ear-ring studs were sterile, there should be no danger of transmission. The gun, even if it is infected, will not pose a danger as long as there was no contact between it and the ear piercing.
The majority of HIV infections are acquired through unprotected sexual relations. Sexual transmission can occur when infected sexual secretions of one partner come into contact with the genital, oral, or rectal mucous membranes of another.
HIV can also be spread through the sharing of needles.Health care workers such as nurses, laboratory workers, and doctors, have also been infected, although this occurs more rarely. People who give and receive tattoos, piercings, and scarification procedures can also be at risk of infection.
In your case there was no involvement of needles, the risk would be minimal to nil.
ref:http://en.wikipedia.org/wiki/HIV