The list really does not surprise me. Maybe the Springfield XDs? I really don't see many XDs running around. Shields, LCP and Glock 19 no surprise there. I think I read somewhere that Ruger has produced over 1.5 million LCPs and Smith has shipped over 1 million Shields. Glock 19 is the most popular model. Sig 238/938 are very popular as well, but I can't imagine them crossing the million unit threshold.