Ive got several on rifle's I have in New Zealand,
Reduce noise on centerfire rifles, by about 30 decibels,
shot's don't disturb game nearby as much, I especially use them on farm land and for pest control, were either disturbing stock, or multiple shots at small game are likely.
Here is my finlight, with one in use, 6 goats were shot from same mob of 8, they mostly milled around, as couldn't determine direction of shot(noise), two were shot running towards me.