if one was to get a complete upper with these specs - 16" m4 cut, chrome lined, m4 handguards, stock fs, 1/9, m3 upper, stock b/c/h from say rra, cmmg (except in 1/7), del-ton, dpms, ameetec, bushmaster, etc - all stuff in ~$480 range(nothing fancy, just the basic m4 setup) should you expect pretty much the same level of accuracy from them for casual shooting, not including leo or military? basically 1-2moa if i do my part? do these places all get their uppers from the same source or are they all built in house but the different vendors? is there one vendor that sticks out above the rest in either a positive or negative manner?
is it the customer service that makes people choose a certain vendor?