I have a Ruger MkIII 22/45 with Tacops 4.5 upper I just put together.
I bought six mags from CDNN that were advertised as factory mags when they had a sale recently.
I've also heard these mags are made by Mecgar and they make them for Ruger and are just as reliable.

I brought only two mags with me to the range and both had fail to feed issues randomly. Same issue for both.
Bolt closes half way on a round that is high of the chamber. Tip of round resting on breach face above chamber.
2-3 rounds every mag with both mags. Winchester and CCI 40 gr.
The reason I suspect the mags is I can wiggle the tip of the top round up and down about 1/8 inch as if the forward portion of the mag lips are opened up too much, out of spec.

Anyone else have issues with these mags or been successful fixing the issue?
And thanks!

Get some real Ruger mags.   Enjoy.  I've got 6 of these I'll sell you.  2 of them ran without issues.   Depends on the day which two these are.