In reading back over all this I wonder if any right handed shooters might be hitting the mag release accidently w/their thumb. The reason I pose this is b/c I'm a leftie but learned to use the semi-auto w/the mag button on the left side. I once shot a S&W w/the mag release reversed to the right side and kept knocking the mag out w/my right thumb over and over again.

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Old Cop
LEO (Ret.)