When shooting long you must keep your gun from tilting left or right. If you are not level, you can easily miss your target by several inches or more. This B Square bubble level installs on a Picatinny mount and is easy to view.

You must also adjust your scope's elevation setting for any up or down angle between you and the target. This Angle Cosine Indicator mounts well, too, and will tell you the factor to apply to your drop table to make an accurate shot at distance.



Both can be seen easily without breaking your hold on the rifle behind the scope.