Like they have mentioned for sight image Rushy, but also don't sit there staring for too long, look away at regular intervals so your eyes don't adjust too quickly. This is probably more so for when your adjusting the sharpness of the reticle and adjusting parrellax. When you have a good sight picture setting parrelax is making sure that no matter where you move your head the centre of the cross hairs don't move from the aim point. Adjust the knob and then move your head up and down, left to right.
If you have a 16gb usb stick pm me for an address and I can load it up with a few handy shooting vids for ya.
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