Have not but if you google how to install the HBI trigger you will pull up a video which shows how to remove the slide release lever and the T Block sits just under it on top of a small spring. Be sure to hold you thumb on top of the T Block as the spring in under tension and it will fly out if you don't. Happened to me when I was installing the HBI trigger and I though I lost it. Took me over an hour to find it.
