THOUGHT I had read this on ARFCOM - but searching the site for a while either gives "500 error code" messages, or no result

May want to go down this route for a couple of competition magazines, so ideally I need a link to the article if anyone knows where it is?
Thanks

Anyone?

I have tried 3d printed "follower upgrades" on several guns and they universally suck.  Typically what you gain in capacity you will lose in reliability, in my experience.  For example I made +2 followers for some GSG/SIG mags.  I have 1 mag that will hold 12 and about 80% of the time feed all 12.  The rest are worse, down to one that will feed 2 rounds and then jam every single time.  I have swapped followers and measured everything I can with a micrometer trying to sort these out, but the solution evades me.  I have had similar results with S&W .22 magazines.  Good luck in your quest, but I wouldn't be hopeful....

Greetings!  

Could I suggest you cross post your query in the Handgun section under .22 pistols?