Been running fine with the POF magazines. I was able to pick up 4 real HK 9mm MP5 mags a few weeks ago. I tired the real HK mags today and it was nothing but jamming.
Are they straight mags or curved mags? Mine has some issues with some of my straight mags, but apparently a lot of MP5's do. Probably why they're curved now.
I would compare the feed lips on your mags to see if the HK ones are deformed at all.
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