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1/25/2018 7:38:29 AM
Posted: 12/17/2001 9:25:39 AM EST
How do you tell if an upper is a true Colt M4? Are there some identifying marks? Thanks.
Link Posted: 12/17/2001 10:40:43 AM EST
One way to tell is to check for feed ramps on the inside of the upper, below the chamber. That`s a patented proprietory feature of the colt uppers. HTH
Link Posted: 12/17/2001 2:44:20 PM EST
Do the feed ramps serve any purpose? (i.e. do they make it more reliable than, say, a Bushmaster M4gery?)
Link Posted: 12/17/2001 3:27:56 PM EST
Link Posted: 12/17/2001 8:29:27 PM EST
They're also stamped "4" or "M4" just above the cloverleaf where the gas tube goes into the upper.... hsld.
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