It is a way for women and men with weaker hands to rack the slides of blowback guns like the PPK/s. My wife couldn't rack the slide at all until I showed her that. Of course one must point the muzzle in a safe direction while doing it, but that goes with all gun handling, we try our best to keep the muzzle from sweeping our friends, and if we accidentally shot our enemies we'd go to jail.
I have CNC produced 416 stainless triggers to replace the plastic triggers on Colt Mustangs, Mustang Plus II's, MK IV Government .380's and Sig P-238's. Video on installation in Sig;http://www.youtube.com/watch?v=Jh2v_-87DRM
Also I made up a hundred Llama .32 and .380 recoil spring buttons, checkered nicely and blued.