Not for glock 42 (use gsr-01 for g42) - TangoDown Glock 43/43X/48 Vickers Tactical Slide Racker

These are awesome on Glocks, but the GSR-02 is not for a Glock 42. They make a GSR-01 just for the thinner Glock 42. One reviewer here said this GSR-02 fit his Glock 42, but it was very wide....so it will apparently fit, but it's too big for the narrower G42.This being said, these are the best slide rackers. They're sturdy (metal inside), they fit great and only protrude slightly. They keep your hand from slipping off the slide, and you can even rack with two fingers. Perfect for racking Glock's strong dual recoil springs.