Upper/Lower receivers - Different Manufacturers
I've been looking at putting together a custom AR and I'm a bit stumped about the difference in receiver manufacturers for both uppers and lowers.
Why do people choose one receiver (upper and lower) manufacturer over another. I get the reason to be picky over trigger systems (CNC is the way I'm going), but given an equally good manufacturing process for receivers, why go with one over the other. Why Black Rain Ordinance over Daniel Defense or DPMS?
What are the pros and cons of different manufacturers? I know Black Rain uses solid aluminum billet machine milled rather than forged for the lowers which, in theory, makes them stronger and lighter.
What else should I watch out for? What would you guys recommend if you were putting together your dream long range AR and why?