HK
Do you have replacement springs for thet VP9 20rd HK magazines? Let's try this one to begin with and see if that's a good fit. HK changed the shape of the follower a year or two back, so if this one doesn't fit let me know and we'll get you the older (M&P-like) pattern.
TF/Wolff Spring for Sig 320 and HK VP9/P30 +5 (13 coil) - Taylorfreelance (taylorfreelancestore.com)
If you KNOW you have the older followers (from the days when the 9mm mags were 15 rounders), this is the older pattern:
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