No, I don't mean I couldn't reverse it, it just didn't work out for me. After reversing my G26, I just couldn't release a magazine with my left thumb.
I'm not sure if it's all the years using my left trigger finger, the arthritis in my left thumb, or my thumbs are too short.
I wound up putting it back the way it was, no problem releasing with my left trigger finger.
Of course, I left the G17 and G21 as is.