User blog comment:Homuhomu123/Trigger Rates & Effectiveness of Anti-Air Cut-In (AACI)/@comment-124.122.131.0-20150608051705/@comment-26193115-20150608080243

Look at homuhomu reply below you, you will see. Like I said, anything related it to main gun including caliber gun or non caliber gun  is classified as B.B.R Build in cut-in. and with AAFD has AAFD buld in cut-in

For an example. Maya setup 20.3 cm+12.7cmHA+FD+Radar+90 mm is B.B.R and has an api value of 5. While if I replace main gun 20.3 cm to another AA gun like 25 mm concerntrate -> it will be classified as H.C.R and has an value of 10 instead.

That matter you should as Homuhomu if you want to go in depth.

3-5 you can run 3BB 3SS with yamato class and bismarck. If you are lacking in reppu. Yes the only way out is to use AA cut-in by Maya. Honestly, without good reppu. I think you shouldn't do north route for now. Try to maintain daily craft to get more reppu to engage in hard map/3-5 map is a troll a hard one.