Talk:Akashi's Improvement Arsenal/@comment-24919870-20141026052200/@comment-24928130-20141026053802

Anything past +6 requires one equipment fodder of the same type in addition to the regular materials consumed. So to get a 12.7cm type b Kai 2, you need 4 more 12.7cm to get it to +10 and then you need ANOTHER 2 more 12.7cms to actually upgrade it from +10 to a 12.7cm Type b Kai 2 (I'm guessing from what's on Wikiwiki here).

6 star 12.7cm + 12.7cm + materials = 7 star 12.7cm

7 star 12.7cm + 12.7cm + materials = 8 star 12.7cm

8 star 12.7cm + 12.7cm + materials = 9 star 12.7cm

9 star 12.7cm + 12.7cm + materials = 10 star 12.7cm

10 star 12.7cm + 2 x 12.7cm + ??? = 12.7cm Type B Kai 2

The number of equipment fodder you need depends on the type of weapon, but just keep in mind that you need spares (unlocked) equipment to get beyond +6.