The AR-15 front sight mounts to the gas block or fixed front sight base on an AR-15 upper receiver. It gives the shooter a reference point for aiming when using iron sights. Shooters co-witness it with a red dot or use it as a standalone sighting option. Fixed and folding versions fit different builds and setups. It pairs with a rear sight for a complete iron sight system. Builders choose it for reliable iron sight capability on any AR-15 configuration.