If you're looking for a standard HD or predator light check out
https://www.nebotools.com/prod_details.php?id=174&cid=29&subid=117&subsubcid=
I personally have this for my 870 for use of predator hunting ,but this has the HD strobe light that would for sure screw up the vision of your target at close quarters. It also has a pretty universal mount that even mounts on ribbed barrels, although this may not mean much to your police barrel. I love this light and comes in 3 different colors.
https://www.nebotools.com/prod_details.php?id=174&cid=29&subid=117&subsubcid=
I personally have this for my 870 for use of predator hunting ,but this has the HD strobe light that would for sure screw up the vision of your target at close quarters. It also has a pretty universal mount that even mounts on ribbed barrels, although this may not mean much to your police barrel. I love this light and comes in 3 different colors.