well ignoring your goofy attempt to be insulting...ill address your earlier concern.
some differences in assembly would be:
torque values
staking of the receiver end plate
properly staking the gas key screws
aeroshell 33ms applied to upper receiver threads as well as the BE
proper HPT/MP testing
some differences in materials used would be:
correct barrel steel (Mil-B-11595E)
correct 7075 mil-spec REs
chrome lining (various parts)
correct springs
correct bolt steel (C158)
correct bolt carrier steel (8620)
H-buffer
grade 8 knurled gas key screws
There are more, but certainly these should be of high importance when choosing a serious rifle...im not saying Colts are perfect...theres just a standard and Colt adheres to it...many other manufacturers do not, its as simple as that....there are also manufacturers that produce a better rifle than colt (depending on whats important to you), but the ones u named, aren't them.
Not to mention the stupid things some manufacturers do like red loctite on RE threads...wonder who that would be.
Thats all fine and dandy....
But Colt dose not make anything in house any more.... Except some, but not all of their barrels, and their lowers... All of the "guts" of the Colt rifles are farmed out...
Mil-Spec. parts, are mil-spec parts...
Not to mention, Colt, in the 90's put a different lower trigger parts, so that, their triggers would not be compatable with standard mil-spec triggers... It's no wounder why people like me who have seen, hundred's of Colt rifle, be at best, a mid-level AR rifle...
BTW..... All of the "Colt" marked mags, were made by OK industry, and simply, had a Colt lower stamped base plate on the Mag...