[MCH] Rapid Fire & Gauss Barrel

When use Rapid Fire, it will make Gauss Barrel become instant equip, but sometime I have issue where Gauss Barrel did not become instant cast but it have cast time and movement do not interrupt it. Does anyone have encounter this issue ? And what can I do to avoide that issue ?

It is latency based. Do not smack it so fast, wait for the rapid fire animation to end before you hit it.

I ll try with macro wait 1 and see how it goes, thank