Search:

If you want to mainly play ranger, that build may cover most of the needs :

http://ryuhiroshi.ry.funpic.de/pso2/gunner.html?01GU!IOI2IbeDqsI34SIk

But when you play gunner this one seems more...

If you want to do gu/ra or ra/gu when subclasses are out, you will want to use chain trigger on your last bullet of weak shot.
Since weak shot is around 90-100secs for most people, more than 5...