I have the original one... the wobble is there, but not that big. I modded it with some steel filled epoxy paste. You can just use some celofane film (like the one for the food) on your mag, then put some epoxy in and insert the mag. Let harden for a few minutes (2-3) and then remove the mag. You can also file or sand the epoxy to have a smooth movement.
I also had trouble using KA metal lowcaps. The hole in the side to snap to the mag catch is too low or too small. I removed the magcatch and worked it a bit so that it is a little bit thinner. Now it clips firmly and there is no problems using other brands (like ICS).
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