I have 3 KA MP5 midcaps, and I've had no feeding issues in my JG MP5. They feed just as reliably as my 3 TM midcaps.
I also have a box of metal KA M4 mags and haven't had an issue in any of my guns with them. I also have a box of plastic AK mags, and haven't had any feed issues with them in my RS Type 56 or my old Double Eagle AK47. IMO, they're a really good product for the price and worth the money.
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