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Posted: 12/26/2003 8:46:42 PM EDT
Does anyone other than Colt make them? Or is that one of the copyrighted features that makes it a "Real" M4.

Link Posted: 12/26/2003 10:00:14 PM EDT
Only the feedramps are Colt's baby but others have been selling uppers with feedramps(LMT, Armalite and others).  Other than LMT, the only question about the pretenders is are their rails milspec?

For example, "T" marked uppers:



Non-Colt with M4 feed ramps:


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