There are several posts about Williams Fire Sights on Rem870.com:
Williams Gun Sight Company: Remington 870 Universal Ghost Ring Firesights
Williams Gun Sight Company: Remington 870 Fiber Optic ACE IN THE HOLE Sight Review
Remington Ghost Ring Firesight Set by Williams Gun Sight Company, Inc.

I decided to try another type of Williams Fire Sights on my Remington 870 with rifle sights:

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Organized “Home Defense” training last week ended. There were 9 participants and one of them had very interesting homemade front sight protection on his Remington 870. I have never seen anything like that before. It protects the front sight from bumps which are very common when a shotgun is heavily used during hunting, competitions or training exercises.

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The XS sight system fits the Remington Pedestal model with a stepped bottom. Also fits Remington shotgun barrels with a front sight pedestal, vent rib models with a flat bottom and ones with ventilated ribs. The sights are designed to fit over existing bead sights from .125 to .140-inch diameters. The sights come with an adhesive that is used to fill in the gaps and to secure the sight to the barrel. The adhesive must fully cure before the shotgun is handled.

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