You need to ditch the junk optic and then try to zero.
My shooting buddy made the ncstar mistake when we were sighting in his AR a couple years ago before I bought my first AR and we could get it sighted in, but it would not be consistent.
A good cheap scope that seems to hold zero are the CenterPoint scopes available at Walmart. That same friend purchased a 4-16x with a 1" tube and has had good luck with it. I have a CenterPoint 3-12x with a 30mm tube that I got from Dick's that has since been discontinued, but has been a excellent scope for the $130 invested. I use it strictly for paper punching but would trust it for more serious use.
All this being said, both of my ARs run Aimpoints.
Sent from my Samsung Galaxy S4
__________________
CBOB0235
|