Points well taken Krusty, but i don't think you see where i'm coming from. Even if the fire control master orders them to all fire at the same time, that doesn't mean that any of them could hit the broad side of a barn. For example, if the order where to be given as the target lay 200 yds off the tail, thats 200 yds for the tail gunner but somewhere around 210 yards for the top turret. What if the tail gunner aims assuming the target is at 190 yds and the top turret thinks it's at 230 yds. They both miss. Hypothetical and maybe a bit extreme, but both gunner miss. Not in AH, they both aim at the EXACT same distance until the target is hit, then shortly there after, shredded.
Also, i don't think there is a "real" convergence for buff guns. I have been shredded at 1000 yds. If they converge at 500, then the x spread of the convergence would mean only one or two guns would hit me. I can safely say, that is not the case lol.