Download Volumetric 3D Lasers FREE Unity. 

Customisable Volumetric 3D Laser System. It will fit perfectly almost in any game, stylized or realistic one. All parts and layers of lasers can be tweaked as you like. Tons of properties, so you can create your own unique looking effect. There are also prefabs for custom particle effects, explosions, and distortions.

BONUS: Sci-fi drone model and some creative particle effects.