Quite a few Brownings had them. Marketing gimmick. Does not add to the performance. Kind of like the Leopold "gold ring" scopes. I have neard many people espouse the vitrues of their Leopold Gold Ring scope. I think all Leopolds have gold rings so they are redundant. Kind of like saying Stainless Steel Smith and Wesson Model 686.
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball