Here's additional rear sights and that is made by gunsmith from Germany. It can be additional to any shotgun with vented rib barrel. I have not observed much better rear sight for vented rib barrel. Absolutely not. The efficiency is similar to that of your already tried and accurate 19RCS. https://lorenzojveps.mybuzzblog.com/8826493/the-single-best-strategy-to-use-for-benelli-600-parts