JG M4 problems

[lotusfallen]

I have a jg m4 and when I fire it it starts to curve right I'm using .28s and the hopup works I just changed the bucking to a new one and it still curves. Does anyone know what the issue could be or what I should try to do to fix it?

[Lancer]

If you are positive that it is not the effect of wind, then the hopup bucking/barrel is probably not in the gun straight. Re-check that.

[lotusfallen]

It definitely isn't the wind but I just got the gun looked at today and everything looked good to them but the original bucking was weak so I got a madbull bucking and fired it and it still won't fire straight

[Lancer]

Then the nub is not centered correctly, but it can really only be those couple things to cause this problem. Also, make sure your barrel is clean.