I am of the opinion a semi auto should function, even if not gripped properly. I test my semi autos by holding loose with bent wrist and elbow. I also turn pistol on its side and upside down. I do this very close to backstop given pistol can jump in my hand. I had a G22 and G23 fail this test. These are fairly recent vintage and may have been that bad run. My G27 which is about 12 years old will pass with nine round mags designed for it, but is jam city with G23 mag. All my 9mm guns pass this test - G26, G19, G17. So in addition to function test, I guess we are getting into the old question of are glocks best in 9mm. Look forward to your response. Thanks.