sight down the actual rifle instead of using the sights.. this will eliminate the potential that the sights are off in windage.
If the bbs are still going off in a direction, it's possible the hop up rubber is not seated properly, you'll need to pull the inner barrel and hop up unit out of the upper and look down the barrel to see if there's any obstruction in the barrel, as well as dial the hop up till you see the mound dropping into the inner barrel. From there you may need to twist the inner barrel back and forth a tiny bit inside the unit so the window and rubber settle. Poor hop assembly seems to be pretty common in g&g.. I've seen a few CMs and some m14s from them with weird ballistics behavior.
I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.