There are lots of these Security Six and Service Six revolvers available used, sometimes in very good condition in the original box. The GP-100 was the first handgun I ever purchased...on the day I turned 21 actually. Thanks to a lengthy hammer spur with aggressive checkering, cocking the hammer isnât an arduous task, and the trigger pull on the sample was 3 lbs., 14 ozs. It's a race gun. There are three barrel lengths available with seven-shot cylindersâ2.5, 4.2 and 6 inchesâall in satin stainless with Rugerâs trademark elastomer rubber grips with hardwood inserts. Ruger makes great firearms.