whats the gunwhere it has a red laser dot

The thing you’re describing is usually a laser sight or red-dot sight , depending on what you mean by the “red laser dot”.

Most likely meanings

• Laser sight: a small red beam/dot projected from the gun onto a target, often attached near the trigger guard or rail.

• Red-dot sight: an optic mounted on top of the firearm; you look through a lens and see a red aiming dot, but it does not project a beam onto the target.

Quick distinction

Feature| Laser sight| Red-dot sight
---|---|---
Dot appears on target| Yes 7| No
Mounted on gun| Often yes 7| Yes 11
Used for aiming| Yes 7| Yes 11

Simple answer

If you saw a red dot shining on the wall or person , it’s probably a laser sight. If you saw a dot inside the shooter’s optic , it’s probably a red-dot sight.

TL;DR: Red dot on the target = laser sight; red dot in the optic = red-dot sight.