use the overload and fine tuner mod (they are already on the game, just activate them), remove the colision of the prop and there it is

@OtakuSquirrel I know this is from literally four years ago, but I just want to give an answer to this. Now that there is 1.9 and XML, click or hover over a gun, and use the Overload button to change XML. Scroll down the properties, and when you see "disable aircraft collisions" click it, and change the "false" input into "true" . This way, the bullets can pass through the prop. Other than that, also you can just disable prop collisions. A hint: guns on the setting in Overload won't hurt you, but they can still rip apart enemy aircraft!

@ElGatoVolador Thats the best way.

@OtakuSquirrel Then I dont know of any fix :( maybe you can try mod the bullet speed so every bullet would go slower than the rpm?

Make the guns up top look the part. Then make it an activation group so they dont fire. Then hide some guns closer to the prop that do the shooting while the other guns just look good :)

Unfortunately the plane Im recreating has the guns quite a ways behind the prop.

Try to put the gun as close to the prop as you can so the bullet will spawn infront of the prop.