The BT4 ERC paintball gun has everything you need to really get things going.  The double trigger on it allows you to get your BPS firing rate up, so you have more paintballs flying toward your target when you need the extra fire power.  The BT RIP Clip is a force fed sound activated hopper which will not starve the gun of the ammunition it needs to win.  Even with the BT4 E frame, the rip clip will provide a constant stream of paintballs.  The APEX Barrel system is the “bunker buster” of paintball.  It puts a spin on the ball that actually makes the ball hook left or right, or up or down at the range you dial in on the fly.  Its like firing mortar shells down on your target until you get them out from behind their cover.  Its a winning combination at a great price.