Holster and GUN HOLDERS are the devices that are used to restrict or stop the unintentional movement of a firearm.
Gun Holder could also mean:
Belt for police duty A belt for the carrying of different tools
Sword scabbard or holster as a holster for swords
Knife holster, for knives
Holster for phones for mobile phones
Finding the ideal balance can be crucial particularly in the case of a holster for defensive weapons in which not being able to quickly access the weapon, or damaging loss of the weapon because of a retention or inadequate protection can result in serious injuries or even death to the person using it.