That was my experience, too, but I got that Mag-na-ported from our Marketplace and upgraded to the DLC and a ported barrel... works for me. I love the P45, too.
9mm isn't my favorite, but the P9 is a backup, and I do have Wifey's G43 and a Lonewolf threaded 9mm conversion barrel for the G23C... very accurate. I have plenty of 9mm mags for that, too, not all Glock... even a 33-rd Korean mag that works. I have one for the G23C, too.
You really have to test those "Asian" mags for function and reliability... bought 20 each 9mm and .40 for resale once, I had to take a razor knife to the retention notch... not pronounced enough... mag would fall out after each shot! All three that I tested, 9mm, had that problem. The .40's were okay.
USAF Retired '88, NRA Life Member. Wife USAF Retired '96
Avatar: Wynn re-enlists his wife Desiree, circa 1988 Loring AFB, ME. 42nd BMW, Heavy (SAC) B-52G's
Frédéric Bastiat’s essay, The Law: http://mises.org/books/thelaw.pdf
Thomas Jefferson said
“A government big enough to give you everything you want, is strong enough to take everything you have.”
and
"Peace is that brief glorious moment in history when everybody stands around reloading".