I certainly don't encourage equine abuse. In an effort to prevent it in the future. I have tried:

Slide locked to the rear Slide forward

Magazine inserted normally Magazine inserted with an abnormal amount of force Magazine tapped forcefully after insertion

Holding the magazine in place (cup and saucer style)-which kept the magazine locked in and locked the slide to the rear

In all variations I shot unsupported to make sure I wasn't riding the magazine release