you can combine quads and duals 5,1", but with the space on the turrets each gun have the same ammo (200 bullets or so) so the quads ran out of ammo faster in the times i use strass, i used the 3,5" duals other problem is, that you have only 4 slots on the ship (1x bo, 3x gunner) so u loose a support slot, when you also want to lvl your other gunner
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