Loaded chamber indicator
Encyclopedia
The loaded chamber indicator is a safety device present on many semi-automatic
Semi-automatic firearm
A semi-automatic, or self-loading firearm is a weapon which performs all steps necessary to prepare the weapon to fire again after firing—assuming cartridges remain in the weapon's feed device or magazine...

 slide handgun
Handgun
A handgun is a firearm designed to be held and operated by one hand. This characteristic differentiates handguns as a general class of firearms from long guns such as rifles and shotguns ....

s intended to alert an operator that there is a round in the chamber. It is a small button (though sometimes a rod, such as on the Ruger series of .22 LR handguns, which are not slide pistols), generally located just behind the ejection port on the slide of the handgun that pops up to indicate the presence of a round in the chamber. This safety device has been around for decades.

An indicator that is behind the ejector port does not rise enough to disrupt a shooter's sight picture
Iron sight
Iron sights are a system of shaped alignment markers used as a sighting device to assist in the aiming of a device such as a firearm, crossbow, or telescope, and exclude the use of optics as in telescopic sights or reflector sights...

, but its height is such that it can be easily seen or felt to alert a user that there is a round in the chamber to avoid accidental discharge of the gun.
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