The LaRue & the Geiselle are both very good 2-stage triggers but they are not drop-in's.
Best 2 that I've used are the Elftmann Match & the Rise 535; both are true drop-in, single action triggers.
The Elf is adjustable, the Rise is not; both have zero creep, almost no perceptible over-travel & a very fast reset.............but they are not cheap.
MM
