Board Thread:General Discussion/@comment-24440536-20141013190739/@comment-24990154-20141018112957

unfortunately, yes. upgrading 6aam to lv5 is a little expensive than upgrading vent d' ange to lv9 (80,000 credits difference).

Although the stat letter doesn't change when you upgrade it, There's a bit difference in lock on range being at 7000m and slightly improved damage.

I'm using a regular shinden and one thing I can say: at lv9 with lv4 6aam armed with sp wp damage L can do 1 hit to orange planes. I still haven't upgraded my shinden to lv 10, i'm still contemplating but I've already made my 6aam to lv5 and I still need the damage L instead of M.