BSA Riflescope Genesis Field Target 10-40x 56mm Side Focus - 30mm

Manufacturer code: 534/QK83256SWF30

Once you have mounted and zeroed your scope the zero should be checked periodically to make sure it has not shifted. This can happen for a number of reasons such as the scope being knocked, or changes in altitude or temperature. If the point of zero has changed the scope will need to be re-zeroed before it is used again. To ensure optimum performance from your scope it is always desirable to keep the erector tube, which carries the reticule (crosshairs), as near to the centre of the scope body as possible when the scope is zeroed. Over adjustment of one turret will lead to a restriction of the amount of adjustment in the other, and can result in difficulty in zeroing your scope. If this happens, you may need to re-centre your scope; or if transferring a scope from one gun to another, you may need to pack the mounts to achieve zero. In which case the following instructions may help.

- http://www.lojadasarmas.com/bsa.htm