Straight up, get some ear plugs until you get used to the sound. Foam ones are real cheap. Practice with it and make sure you learn how to tear it apart and maintain it.
new barrel. you can get one off websites for $30-40. when i had my eradicator i got a new barrel and it shot really straight. the barrel will also make it quieter.
Yeah, a couple of Eradicators have bad paint to barell match on the original stock, I have a heard a lot of people talk about it, and it happens with my friend's also.