During a recent holiday sale, I bought some of the Taran Versatile base pads. These are 140mm extensions that work on many (CZ, Canik, Walther, Beretta) different platform magazines. I got them for the Walther PDP, but before I deployed them, I ended up using them on MecGar 18 rounds 226 mags for my wife's new 226 X5.
https://tarantacticalinnovations.com...tile-base-pad/
I did try them, unsuccessfully, on a Macro mag. Taran's description says they work on the Macro, but at least with the two mags I tried, the mag would need to be slightly modified to allow the push pin in the extension to work properly, and I didn't want to do that. These things FS are great for someone that likes to mess around with different platforms.