new MRD, which red dots are most folks using?

I'm partial to Trijicon products (RMR, SRO and MRO for bull-pups)....but wondering what folks like on their FN Five Seven

2 other questions...
1) are the new optic ready FN FiveSeven's coming with NIGHT sights?
2) why don't they come with threaded barrel, if come with suppressor height sights? Silly! Best place to get a threaded barrel for this new model?

Thanks!
CJ
602-315-3996