The advantage of using a rifle-scope sun-shield extension is that it allows you to shoot closer into the sun without the rays effecting your line of sight. They can also be useful when shooting in the rain, by stopping water being deposited on the scope lens. Aesthetically, they also add balance and symmetry to the look and style of the rifle, and can be the ‘finishing touch’ on a custom project as it matches and complements the rest of the rifle.
Below: Photo taken with my phone, so not the best quality, but showing a nice carbon-fibre cut-away sun-shield extension on my Nitro Crosman, matching the carbon-fibre over-barrel silencer .
Below: QB79 with matching silencer, sun-shield extension and stock.
Below: Matching sun-shield extension, silencer and CO2 Reservoir. This was also one of the first wooden rifle-stocks that I experimented with full rubber coating. The outcome was excellent and permanent.