Stock triggers vs Geissele/KAC/MBT, anything inherently more reliable or durable ?

[Pappabear]

We replaced 3rd Ranger Battalion and Regiment Sniper KAC SPR triggers after approximately 3,500 rounds (losing their first stage).

So was the first stage worn out at 3,500 rounds or did the conversion cause them to lose the first stage. Interesting and insightful post Sinister.

PB