Never got to see the movie all the way through. But I believe the basic plot is some teenage boy, finds some kind of alien weapon, has a standoff with the fbi or the army, is convinced he is going to be taken off earth by aliens. I think he tries to use the weapon against the soldiers, or is halucinating that the weapon even works? And at the end of the climax of the movie is killed by the government guys/army in the standoff, the scene is at night... don't think it's that movie Lazerblast but I really have no idea. Anybody out there know what I'm talking about? All right, thanks

Flight Of The Navigator maybe?

Deadly Weapon (1989)
Starring Rodney Eastman
IMDb synopsis:
An experimental gun powered by an atomic reactor is misplaced when the transport carrying it crashes into a river. The weapon soon falls into the hands of a bullied teen named Zeke, who uses it to get even with his persecutors. An Army team led by the overzealous Lt. Dalton is sent to recover the weapon before its unstable reactor overloads and causes a meltdown.

Deadly Weapon (1989) - IMDb

It was originally envisioned by executive producer Charles Band as a sequel to "Laserblast", but, after the fall of Empire Pictures, the ideas were recycled.