Took my son shooting for the second time today. The first time he shot my Glock 19 and 43 he didn't experience any failures. Today, however, he was having failure to feed in both. I also shot both but didn't experience any failures. My guess is that the first time he shot two weeks ago, he gripped the pistols solidly since he didn't know what to expect. Today, I think he got comfortable and more focused on his sights and the target, and relaxed his grip. I told him to go a little higher on his grip and keep firmness. No more failures after that.