Overwatch Precision
Flat-faced drop-in trigger kit cut specifically for the Glock 42. The only widely available flat-face option for the G42 since Apex's slim-frame kit excludes it. Includes shoe, connector, and competition spring.

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Overwatch Precision OEM PolyDAT Drop In Pistol Trigger Kit, .380 Auto, NP3 Coated, G42, Black/Black, 27622-8
The Overwatch Precision DAT (Defensive Applications Trigger) is the only mainstream flat-face trigger built specifically for the Glock 42. Apex's slim-frame Action Enhancement Kit fits the G43, G43X, and G48 but explicitly does not fit the G42, which leaves G42 owners with very few flat-face options. The DAT kit ships with a polymer flat-face trigger shoe, an Overwatch connector, and a competition trigger spring; together they reduce pre-travel by roughly 20% and shorten the reset.
Installation is drop-in. Field strip the pistol, remove the trigger group from the frame, swap the shoe and connector, replace the trigger spring, and reassemble. About 15 minutes with a punch kit. The flat face is a feel preference, not universally preferred over a curved factory shoe; some shooters find the flat profile gives more leverage on a small grip while others find it changes the index point.
Add the DAT Drop-In Trigger Kit (Glock 42) to your build and see how it enhances your platform.