All you need is a no-shoot and two sheets of high contrast paper:
With irons, it allows you to see if your front sight is too low or too
high since you'll see a bunch of white and two arrows if you're holding
low, a bunch of white and no arrows if you're high, and two perfect
points if you're dead on.
I mount it head-down for a 200 & 300 yard zero. You can vary the dimensions to match your front sight width, 300 yard drop point (if you
use a 200 yard zero), or even have the target match your BDC.
If you have a red dot (you shouldn't choose red paper if so) or a
prismatic, I have also found that the triangle above the arrows makes a good
sight picture as well.
The white area above the two arrows and below the triangle can be
occupied by a 2 MOA reticule which fits nicely for a good precise
aiming point.
To replace the target, simply cut an hourglass shaped piece of white paper to tape to the front and tape a piece of white paper on the back of the target to cover any holes in the red areas.
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