use the 9mm mags for best reliability when using a G22 9mm Conversion barrel.
My G22 has also been upgraded with a 9mm extended/LOADED CHAMBER extractor,
AND A 9MM EJECTOR...
but these are not absolutely necessary, and not every one is as retentive as me.
The 9mm ejector/extractor are a bit tighter/closer to the bore centerline, and THEORETICALLY work better in bisexual .40 & 9mm mode than do the .40 ejector and extractor.
in actual testing, I had no failures with the .40 stuff, but I read somewhere on the internet that the 9mm stuff was best, so it must be true,
LAZ 1