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.
If you bump your scope while moving it will have to be sighted-in again. 
( z1 obligate :ARG2 ( z2 see :ARG1 ( z3 it ) :mod ( z4 again ) ) :condition ( z5 bump :ARG0 ( z6 you ) :ARG1 ( z7 scope :poss z6 ) :time ( z8 move :ARG0 z6 ) ) )