I would agree with Jtl15. Even though the Responce trigger will up your ROF, you will need an electro hopper to keep up. But, if your shots are all breaking or going in the wrong direction, you won't be hitting **** with the extra paint. Go for an Exel barrel or maybe one of those Freak Jr. barrels which come with just one insert but when you have more money, you can buy more.
Hope this helps