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I have a Colt conversion kit. I had some malfunctions when I first used it. Tried some standard velocity ammo and it runs like a Singer sewing machine.
Only problem, extra magazines are $$$$ expensive. I tried some aftermarket and they have a multitude of problems. One feeds fine, but I have to pry the magazine out of the pistol.
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Yeah, and they weren't inexpensive 15-20 years ago when I knew that needed to stockpile quite a few OEM mags.
Have you considered calling Nelson or Frerking, and asking if their mags are compatible with Colt units, with user feedback?
If I was starting down this path now, I'd cry once and go with Nelson. They have a following among the competitive shooters for a reason, their pricing isn't significantly different from the new Marvels are selling for at Frerking Custom, and wherever I got the conversion, I would definitely get enough mags to keep the pistol going for a generation or two of my family.