Well I have a pair AA KM Gunners level 112(EU NF), and class them at right time. And have no problem using them except when I press the spacebar already 5 salvos are out(3.41" AA gun). And when that happens you don't need block shoots.
In my experience a little of spread in KM AA guns is always good.

What is buckshot sorry im new is there any kind of guide how to do it?

i have IJN, KM and US AA.. id say accuracy doesnt matter that much at higher lvls (100+).. i classed my EBVE (110 vets) KM RF gunners on time and got no problems even when i was still in H39..

I did some research. Armament sailors gain 6 crew per level. AA gunners to Chief rapid fire gunner get 6 crew per level. So the loss that normally applies from delaying classification does not exist (KM AA Gunners are somewhat unique in this). However, you will still miss out on 2 rld for as long as you delay classing them.

When to class AA gunners of the different nations.


KM: Class as AA gunners ASAP (@lvl 21-ish) ...
Then class on time all the way up through the Rapid Gunner line.
This is the one nation that gains reload on classing as AA gunners and each advancement thereafter.


US, UK, IJN: Speed/power level as ARMAMENT sailors (lvl 12 - 65+)...
Leave your gunners as ARMAMENT Sailors from lvl 12-70 ... then class them up the AA tree.
(NOTE: for the IJN = do NOT class them as Machine Gunners - that function has been turned off - wastes your sailor - make sure you class them up the AA DP branch when the time comes @ 65+).

Generally speaking, 70 is the min for decent gunners from what I have heard. The longer you wait to class them over, the better reload and accuracy you will have. For these nations, you loose quite a bit of reload and accuracy growth as you class them over. (example. if you class US gunners on time, you will have maybe 700-800 reload and accuracy at lvl 70 with a growth of +2 or so per level. Meanwhile, if you wait till lvl 70, you will have around 1500 ability or so). The longer you wait the better. There is also a benefit of leaving them as armament sailors which is a boost in exp. you can throw them on a PBB for leveling and on a good game get 40k exp pretty easily on them and 67k+ on a good game. if I remember correctly, I classed my US ones over at lvl 90 and they had around 2k ability for accuracy and reload. Alternatively, you can use reload gunners for US or UK (not recommended for IJN) but you won't have access to the special AA guns that are usually lighter and harder hitting (and faster reload) or PomPoms and quad aa guns for the dunk.

We did some experimenting and found that the IJN late-classing method works real well for US and UK as well. I like it because I can get access to the US dual 6' guns for aa but using the A version instead of the D version of the gun, it weighs less than half the weight of the D version. As for UK, I have access to PomPoms and the special quad AA guns for the Dunk. By power leveling them, I could get a pretty good reload and accuracy ability. Most people just do the reload gunners, but I like the perks of having the AA gunners. Just had to find a way around the loss of accuracy and reload. Classing late gets around most of the drawbacks.


MN: Just class them up the REGULAR Gunner tree ASAP. ......
(WARNING: like the ijn = do NOT class as Machine Gunners - that function has been turned off - wastes your sailor).

Just class it once and stay in that forever. You will meet both acc reload cap easy