So, after getting bounced from the challenge quickly I figured I'd practice my gunnery and started a late war campaign. Spad VII - no problem.
Okay, slight problem.
As you can see, the gun is off center, which means the sight is useless. In fact, I've had decent success assuming my bullets will lands somewhere in the yellow circle.
Is there a trick to centering that gun? Or am I 'doing it right'?