I bought two blasters for my mod. I wanted to extend the barrel as well as the stock so it was easy to line up. I used a chop saw to cut a neat line on the barrels. this way they line up properly. I will say becareful when you take it apart not because of the internals because it is easy to snap the casing. If you do end up needing spare parts incase you break something just contract me as I have an extra speaker and circuit board and battery holder from the second one. You can have them for free if you need them just PM me.
Oh and if you chop the barrel take the guts out first or you will cut though the plastic that holds the lights.