There are lots of these Security Six and Service Six revolvers available used, sometimes in very good condition in the original box. The good thing about maintaining this gun is that it’s pretty easy to do. with six-shot cylindersâRuger is now offering a seven-shot version of the reliable revolver. Who needs a seven shot .357 Magnum revolver? I was under 21, but over 18, so my father bought it for me. I'm in love with this revolver. Boompa....I too fell in love with the TALO edition. There are a few changes that weâd suggest. Itâs hard to believe the Ruger GP100 is 35 years old.