I picked up this link from the CATM website. It's written by a Brit gun collector, and he's a little opinionated but then, who isn't. He's done his homework though and most of what he say's jives with my own first hand knowledge of Colt's development of Carbine versions of the M-16.
http://www.cybershooters.org/dgca/bushmaster_m4.htm
It's a good read if you're into firearms and weapons development.
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