I have the KM4A1, which is probably the same magwell as the tac, and the box of KA metal midcaps I got are not compatible; I have to press upwards on the mags to get them to feed properly. Otherwise, they dry fart a lot.
I tried those plastic branded midcaps (MAG or Star, can't remember which) and found them incompatible as well.
I finally got 5 TM metal midcaps from Redwolf, and they work perfectly.
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KWA KM4A1 - CA MP5SD3 - KWA KMP9 - WE Wilson Combat CQB Elite
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