Put this on a g42, have another set for a g43 - Truglo Brite Site Glock 42 Fiber Optic Red Front Green Rear 3 Dot Sight

While in general I'm not a fan of a busy rear sight, I really like fiber optic front sights. In this particular case, given the tiny size of the G42 and G43, the green rear sight doesn't distract from the red front, and it makes it extremely easy to quickly acquire and line up the sights.

I use these pistols both for backup carry guns, and for GSSF competitions, and they work extremely well.

At half (or less) the price of a set of Dawsons, they are worth it.