How to use adjustable objective rifle scopes<br>Be sure that your scope is mounted properly. Sighting-in can have been done preliminarily, but additional sighting-in will be desirable after following these steps : Know your rifle. There are actually two optical systems in a rifle scope.
The scope is only good for 500 yards. 
( z1 good :ARG1 ( z2 scope ) :ARG2 ( z3 distance-quantity :quant 500 :unit ( z4 yard ) :mod ( z5 only ) ) )