A gunner ace would be someone who manned an AA gun on a ship, on the ground, or at the back of an aircraft, and got 5 or more kills (of enemy aircraft) over the course of the war.
Were there any such gunner aces in WW2 (did they even record such things so we know which person got a kill from which gun)? If so, did they ever talk about how or why they were so good, like what techniques they used? (other than leading the target).
Not really interested in any particular belligerent. German, Russian, Italian, British, French, Canadian, Japan, America, Dutch, many others too.