where is the gun on an....

F-18? I look around on my model but there is no likely spot that the bullets come out of.

or is it unarmed in the gunnery way?

The F/A-18 Hornet has a 20mm Vulcan 6 barrel cannon on top of the nose between the canopy and the radome. It also has a gas vent opening on either side of it

Darwin, O.F. [alien]

ohhhhhhh, so that’s where it is.
the place where there are three holes side by side. (not ENTIRELY side by side)