A firearm illuminator has a housing having a front portion, a rear portion, and an intermediate portion between the front and rear positions, a light source at the front portion, a power source at the rear portion, a power conductor interconnecting the light source and the power source and coextensive with the intermediate portion, and a weapon sight connected at the intermediate portion between the light source and the power source. the weapon sight may be a post sight. The weapon sight may be a front sight configured to register with a rear weapon sight. The weapon sight may be movable between a stowed position and an extended position. An indicating portion of the weapon sight extends above the housing when in the extended position. The housing may have an upper surface below a selected limit level. The weapon sight may be configured to extend above the limit level.