Drop ins are good. Lot of folks prefer the pieces and parts. You won't have any issues with the CMC. I'd bet 99.9% there would never be an issue, but as far as self defense, my brain wouldn't go for a box trigger. That said I have a few range toys with box trigger and never had a hiccup I could blame on them.So, you're not a fan of drop in trigger groups?
I can understand milspec type triggers and springs would be a plus in a mad max situation. That BCM might be a better call.