I have had better luck with the newer design mags that supposedly will not fit the earlier guns.Both of those should be pretty reliable. With the MK pistols, there's a feedlip mod you can do.
All I had to do was remove the pin that holds the follower and move it to the other side.
These are the mags with the small coil spring under the follower front, not sure of the parts number though.
I'm good with what I have, but that feed lip mod may be of interest to others, post it up!
jmo,
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