You mean invisible guns or "built-in" guns, I mean hardpoints for normal visible guns
located so, that you could not see the gun attached?
Both variants are possible.

Well imagine U have a cube and U place a skyblast B gun on each face of the cube....the guns are on the surface of the cube but U cant see them because they are invisible...only the "bullets" coming out when U fire....I hope I was clear enough....

Similar to the Borg?

it has no importance I just want some guns that are on the surface of a ship to be invisible...like the hullblazer guns or like the guns in freeworlds mod...

You could try the following:

a) Place the weapon hardpoints inside the geometry of your ship model so that the weapons are obscured by the ship itself. This works best if your ship geometry is rather large, as the larger weapons may still poke out under certain circumstances. For the naboo fighter, you'll probably want to place hardpoints inside the fuselage itself. This method will allow you to swap weapons in and out in-game as you please.

b) Create custom guns and use the nomad gun model (no_fighter_gun.cmp) for them. The nomad guns are essentially invisible but function like regular weapons. This method will allow you to place your gun hardpoints anywhere on your ship model and still have them invisible. Downside is that you probably won't be able to alter your loadoun in-game unless you have other invisible weapons added as well. Alternately, you could use the nomad weapons already in-game instead of creating custom ones for your ship.

That would specifically be the nomad lasers since the blaster and cannons can be seen. (They have to be that way to maintain the clean organic appearance of the nomad ships)

You can simply give the gun you want to be invisible no_fighter_gun.cmp.
That wiil do the trick.

P.S.
anybody can help me with capship missions?