In a court of law, that statement would be disallowed. Pure speculation, at best.
Pills
Gas ovens
Slit wrists
carbon monoxide
etc.
Many ways to off oneself without a gun. A gun leaves you no chance to change your mind, or give you a second chance.
I once read about a man in Indiana that committed suicide with a claw hammer. At first, the police suspected murder, as he had been hit in the head 21 times!! Coroner confirmed suicide.