Fighter pilots have something like that in real life now.
Only if you "think in Russian." HUDs are very sophisticated today, and many smartphones feature "augmented reality" apps. One could rationalize anything, including something as simple as a "laser sight."
The animators for Disney's THE BLACK HOLE were plagued by actors pointing everywhere but at the targets, resulting in beams coming out of the barrel at a skewed angle. So the actors had to be coached how to fire their space guns. And if you thought George Takei running loose with a foil was a problem...
Don't give Charlie a hard time - after all, he did end up playing second fiddle to a tin can who was programmed to educate him.
Those The Black Hole laser guns were pretty cool, though.