Colt, DD, LMT, BC, LaRue, KNS, Geisslee for parts.
Lowers I am not 100% sure how much this matters with a good parts kit and good trigger?
Uppers do matter to me more DD, Colt, VLTOR, BCM,YHM
Here is a question for you...does anyone know if the anderson lowers are the same hardness as a Colt lower? I kind of regret building a gun using an Anderson lower back during Zero's reign and wonder if it will wear out faster?
