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Why are you only firing from the Inner most barrel anyways? The paintbrushes are representative when you look from the outermost barrels.

Also Chibi, your Right-hand Red-line intersects with the outer-most barrel of the Right Lascannon(where you to put a line across that barrel and follow it down); and you can see your left line cross one side of the Barrel to the other side as it "runs parallel"

The correct arc is just about right in between your lines, and the OP's painbrushes.

At any rate you are arguing slight semantics over a few degrees and declaring that the Weapon cannot fire thusly because LOS is blocked for 1 of the 2 available barrels on each individual weapon system. The rules do not cover twin-linked barrels, nor should they as you can fairly often get a situation where 1 barrel of a gun does not have LOS to a target where the other barrel does(most of the time this exact situation is true). the Converging point for the outer most lascannon Barrels will be about a half-inch further out than the 2 inner-most; this is true. But the targets for those guns are likely to be much larger; and it is not often going to matter.

The OP's question has been answered; use the actual traverse of the actual model, drawing a straight line from either barrel; this is their Firing Arc.

The barrels of the gun are facing slightly inwards.
I assure you they are aligned as accurately as GIMP would allow,

Ascalan
In the case of the LR the guns in a sponson are not firing indepenently of each other afaik
The reason being that if both guns are to be used for practical purposes the limiting factor to true line of sight would be the inner gun.

It would still seem to me to be the most reasonable ting to say that the inner gun cannot go past the line parallel to the hull.

Since I am now repeating myself and have little to add it will be best to withdraw from the thread

Thanks guys, once again if I had my dang brb I would search through it till I found what I am talking about or declare the whole "shooting through hull" is incorrect, anyway, as Kommissar Kel stated, I have my answer, thanks again guys, even with those who disagreed, for helping me explore and debate all the options!

I'm aware that they're not fired independently. Neither are whirlwind pods or twin-linked guns from a wave serpent, for example, but as long as you can draw LOS for the weapon (any barrel) you can shoot the person in LOS,

(or would you argue that a Wave serepent with only one side of it's turret visible past a building would lose twin linked?)

The rules offer nothing either way on how to handle a twin-linked weapon with LoS from only one of the barrels.

Front mounted land guns are legal, but there is merit to mounting them in the rear. Depending on circumstances and the size of the squad sometimes it's better for the passengers for the guns to be placed in the rear.

Chibi Bodge-Battle wrote:tbh I would prefer that a line parallel to the side of the LR would be used.

edit: Ascalam is correct afaik
Shooting your own vehicle is generally not recommended and not allowed in 40K

You don't know about Chaos Dreadnoughts, do you? XD