PHANTOM CQB outer barrel help

Im trying to add a rizer nt1 to my phantom CQB and having trouble taking out the outer barrel. Ive messaged other people about it that have it and have said theirs is locked with a grub screw and was a simple screw off.
Mine does not have a grub on the adaptor and im sure it is glued on. Is there a way to get it off or have someone sell a similar adaptor to fit this blaster so i can use my nt1 thanks

Hey mate, first off you dont need to remove the stock outer barrel to use the nt1 hopup. Secondly you will or should look at getting a longer inner barrel, your looking at about 70mm extra length. The nt1 hides quite nicely in a silencer