FWIW, since incorporating Vogel's grip technique, I began to get premature lock-back when using the Vicker's slide releases. As a result, I have mostly gone back to Glock OEM ones and the problem has ceased. Likewise, I bent off two additional GFA's since the class, so have removed them from all my Glocks (although I still prefer the control and ergonomics the GFA offers). I have also begun taking out all the Vickers mag releases I had in preference of re-shaped Glock OEM extended ones, as these seem to offer much more positive mag drops for me.