Why on God's green earth did you get it done with a gun? Are you insane? All piercings, body especially, should be done with needles. Sterile, large needles. On another point I would go and buy a new piercing ASAP. Like, tomorrow. When you get it, steralise it and then put it in. It shouldn't be this long. if you can bend it into an L try that. You might need pliers.
Source: I have many piercings