I have a Gen2 21 Blue Label that I bought on a letterhead during the AWB. It went through the academy with me and was carried till I left that department. It now resides in a quick access safe near my reloading bench. I also have a Gen3 21SF that I use as a match pistol. It fits my hands better than my 21. It’s got about 5k rounds through it and still going strong. I’ve read that the Gen-4 21 without the grips has the same grip dimensions as the 21SF, but I haven’t had one in my hands yet.