No surprises on the Shield mags, they are made by Checkmate Industries who supply the U.S. military with the M-14 mags, Top quality! I went to a G48 for daily carry over my 19 and could not be happier. Slim and compact, carries and conceals well. As a diehard 1911 fan, it took a while to get used to the idea of a Glock, but their reliability out of the box is outstanding and if one of mine got lost or stolen, I can just go buy another. If I lost one of my custom 45's, I'd be heartbroken!