Here is what he's talking about: http://pistol-training.com/archives/6459
Take note of where it snapped. Now think of all the other connectors with fancy shapes, speed holes, debris channels, etc...
FWIW, I never did like the LWD "minus" connectors. I tried a couple, and ended up tossing them back in the parts bin, or giving them away. OEM Glock for me.