I don't have the KA p90 so I can't tell you for sure. They're very sensitive to the finish of the BBs you use. ones with stickier polish will load and unload with issues, whereas bastards with a very smooth/slick finish will load and unload very well.
Only way to find out for sure is to find someone local to you who has those mags and try them... or take the chance and buy them and try.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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