This might be something lots of GTA players never noticed or didn't pay much attention to it, but for me it also gives a GTA game its own flair. Im talking about these ,,stripes'' or ,,lines'' which resembles the bullet every time you shot a gun.
For an instance:
GTA 3 and GTA Vicecity had these grey and smoky lines. I think you all know this smoke lines that appear all over your screen for a second during a shoot-out, especially when you use machine guns.
GTA SanAndreas tried to make it more realistic by replacing these grey, smoky line swith thin and yellow lines which looked more like yellow laser beams.
GTA Libertycitystories and Vicecitytsories also used yellow laser beams, but it was much thicker and more noticeable.
GTA 4 pretty much used the same yellow lines from GTA SanAndreas.
GTA 5 went old school and used smoke lines like GTA 3 (not as thick like GTA Viceicty)