I broke the front fiber optic sight on my inline muzzleloader the first day I had it. I came up with this injection molded clamp on plastic guard not unlike the sight guard found on WW-1 enfield rifles . Made to fit most round inline barrels and also fits most 12 gauge shotgun barrels with fiber optic sights as well. Protect your tender fiber optic sight from getting accidently broken in the field at that unopurtune time.