I just wanted to get the 4 oz because I don't want to buy a bunch of 12 grams in the beggining when I am just shooting in my yard to get used to the gun. Having to change 12g at the target range might be kind of a pain, so I would just use the 4 oz for that (I also play in the desert sometimes so I don't want to accidently leave any 12g on the ground, I want to keep my field clean

) I read a barrel review for the phantom on the PHOG website and they said something about the Nickle Plated Ported barrel being one of the best aftermaret barrels for the Phantom, so I thought it my help, may not get it for a while but, ow well, thank for the advice...