Quoted: Just to toss in $.02 worth of history- One reason you may have that storied barrel in your possession is that the ~3000 RO921HB uppers sent to the Army in 2001 were eventually all tossed and replaced around 2003 by new ones. Apparently there was some defect in the original construction.. I've heard different stories about the exact nature of the flaw- one story was just that many barrel nuts were not torqued properly- the other story was an actual design flaw in the barrel. Maybe KMFDM or some Colt RKI can step in with more info.
FWIW, I know of RO921HB uppers from that time that run flawlessly- the problems may have only been in a small (but unacceptably large) % of the total run..
HTH
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I have seen quite a few misassembled M4 uppers myself. Even started a thread on the topic here:
www.10-8forums.com/ubbthreads/showflat.php?Cat=0&Number=2660&an=0&page=0#2660Every time I bring up the problems with Colt's and their sloppy assembly of their carbines, I get little response, and not much in the way of answers.
In addition this particular upper did not function in the condition I got it in (no doubt the reason it had not been shot much). Unlike the A1 and A2, with M4 uppers am careful to test them full auto (on my buddies registered lower) prior to spending any amount of time or money on them. Any how, got this one up and running, and run it does, like a sewing machine.
In regards to the 2001 issue M4A1's, have not heard of those being replaced. I know a guy in 10th SFG, and last I knew they still were using their 2001 issue M4A1's, and still had some from the first issue (1995/96). That being said, don't know a soul in 3rd SFG, but apparently they dumped some huh?