I always played that, if I can turn the gun in a certain direction, I can fire it in that direction, but, anyhow, is the raider gun/ravager non-sponson gun pintle mounted, turret or hull mounted? I usually turn a broadside* to the enemy, and shoot it. Can I do that? How about the venom? Is it one pintle one hull? (I model mine with both SC as under-wing mounted, does that make them both Hull mounted?).
* This way, if it's wrecked, my kabalites get a free barricade to stand behind when they disembark.