The design and internal hammer action of the Security-9 pistol are derived from firearms first produced by Kel-Tec (such as the P11) circa 1995.

Ruger calls this mechanism the "Secure Action" design, and it combines the trigger pull of the LCP with single-action, as it has a positive reset.

However, it has features that the full-sized SR9 did not, including front cocking serrations and a standard Picatinny rail for accessories.

The Pro models are a higher-end version of the standard Security-9 and Security-9 Compact, but feature factory-installed steel tritium night sights and no manual thumb safety.

[4] Ruger also offers the Security-9 in different colors: Davidson's Flat Dark Earth, Black, TALO Turquoise, Sports South Silver, RSR Group Cobalt, Big Rock Sports Coyote Brown, Davidson's Battleworn Flag, Lipsey's Flat Dark Earth Frame(Black slide).