I performed some quick measurements on 3 different magazines.
1 OEM, 1 Canik and 1 Mec-gar. They all measured the same ---
Side to side : 0.800 (+/- 0.002) Front to back : 1.252 (+/- 0.002)
Finishes are different, so that could be the issue.
If it remains a problem, an option is to simply remove the "Magazine Guide" all together.
It won't affect the insertion or ejection of your magazines, and won't bring unwanted dirt onto the Main spring (urban myth).
The original use of a "Magazine Guide" was to stop the magazine ejection during an inadvertent press of the magazine release, and gives the shooter the possibility to reinsert the magazine, specifically for law enforcement and military.