clandestine
AR-15 Savant
Fouling a particle of foul: Make foul or dirty; pollute.
Okay I understand what Clandestine is saying (and I like this trigger). Okay a lower has a huge void where dirt, debris, etc and other "fowling" has a place to go (somewhere in that huge void). But with a drop in trigger such as this one, if debris gets caught in this much smaller area it can possibly cause malfunctions. The chances are higher with this smaller more compact area which can keep the dirt near crucial moving parts of the trigger.
I was just offering my view, please understand that I mean no offense to you Wayne.
Its good review. You do good work with your media posting. I always enjoy it.