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Message: <blockquote data-quote="KurtM" data-source="post: 1103591" data-attributes="member: 6064">Well since only 3 companies make the blank lower receiver that everyone uses to mill out their "own" lower receiver, I fail to see how Colt is sooo much better than anyone else's cause they don't "sole source" their blank...it can come from any of the 3, same for upper blanks...except there are 6 companies that make the upper blank.For Lower blanks..Martin Marietta, Cerro Forge, and AlcoaFor Uppers... Alcoa, Kaiser aluminum, Anchor Harvey, Mueller Brass, Marten Marietta, and Cerro forge, so can anyone tell me why Colt is so much better, when they mix and match all the above, just like all the other big builders? A Bushmaster upper with a key hole mark ( Cerro Forge ) is inferior to a Colt upper with a Key Hole on it how?? A Les Baer upper with the Key Hole is worse than a Colt Key Hole How??  They all came from the same forge, but I am to be told that when Colt buys it it magically becomes better??I think it was said best when someone pointed out that the "mil spec" of the AR is circa 1957, so you are worshiping 1957 metallurgy and technology.... basically. Great old timer but things do advance.I for one will take the one that has the best machining cause if they are doing that right, chances are that they took the time to make sure all the important holes are in the right place too!</blockquote>