I have one on the carbine I keep for ready service. It helps keep my hand where I need it to be, so in that respect I guess it works as designed. But it is largely just extraneous kit at this point. I experimented with reversing the orientation to set up a push pull with support hand thumb oriented forward. Thought I had a brainstorm or maybe a better way, but that configuration was kludgey in training with that configuration . An actual hand stop, or a stubby VFG worked way better if that approach was desired.