Any weapon you mount a scope on needs adjustments. Mounting a scope only takes 1/2 hour. After it's mounted,go to a 25 yard range and start from there...just to get it hitting paper. Slug guns such as the 870 are only good for shots around 100 yards so sight the gun in at 100 yards. As for the scope,Bushnell and Tasco will do the job just fine...<img src=icon_smile_big.gif border=0 align=middle>

Hunt Safe!

Jack