I like the Mecgar mags too, and have several. Some years back, I tried a bolt-on magwell extension, but the Mecgars as stated, were too wide. I ditched the magwell.
Now, I've just installed a set of the old classic Fitz C45 target grips, and was concerned about this. Luckily, the Mecgars work fine. :grin:
I have one Wilson Combat mag, and wouldn't mind getting a few more. Great mags.