The Security Six, is one of the finest medium frame revolvers ever made! It was introduced by Ruger in 1971! It is slightly larger than an S&W K-frame! It is one of the strongest revolvers ever made(For it's size)!
Unlike the old time "Hammer & forged" gun technology(Like S&W and Colt)the security six was made from cast steel(Not, cast iron=cast iron is weak and cast steel is strong!)and, this simplified production costs! Also, unlike S&W(Which was originally designed for cops to train with(Using .38 special's and only to shoot .357 magnum's occassionally!)Ruger designed the Security Six(From the ground up)to withstand the constant shooting of .357 magnum's!
Also "Unique" in revolver manufacturing(Increasing frame strength)was the modular construction of the Security Six(And, later Six Series revolvers: Service Six, and Speed-Six)for tool free takedown(For cleaning or for inspection)!
The Security Six, has proven itself in service(All around the world)in police departments(Etc.)to be one tough(And, reliable!)revolver! It has one of the finest service records(With an extremely low incidence of needing to be sent back to the factory for repairs!)!
The only negative usually heard about the Security Six, is that the trigger is not as good as on the older S&W's! This is true! But, just shooting these guns will break the trigger in, to feel much better! and, if you add a Bullseye(Or, Wolff)spring kit, the trigger pull, can be very nice, indeed!
The solid frame construction, is also nice(Aside from having greater strength)because there are no sideplate screws to shoot loose!
In summary: The Security Six, is one tough and rugged sixgun! It can be disassembled in just a few minutes for cleaning and/or inspection! It is much stronger than the S&W K-frames! Yet, it handles as easily as the S&W K-frame! For it's size, it is virtually bullet proof! During it's production run(1971 through 1985)Ruger had sold more than two million of these "Fine" revolvers! This proves just how popular these guns were!
You have a wonderful and reliable revolver-enjoy it! It will outlive you!