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Posted: 11/18/2008 7:50:56 AM EDT
Is this legit?

It is marked "M4" above the gas tube hole.

I did come from Brownells, so I would assume it is what they say it is.
Link Posted: 11/18/2008 8:22:38 AM EDT
Yes!

Link Posted: 11/18/2008 10:28:42 AM EDT
I've received one like that from them too.
Link Posted: 11/18/2008 1:18:36 PM EDT
Is their a proof mark by the front of the ejection port?  Should look like a C within a square, if that's there than it's definately Colt.
Link Posted: 11/18/2008 1:52:48 PM EDT
Originally Posted By Leg:
Is their a proof mark by the front of the ejection port?  Should look like a C within a square, if that's there than it's definately Colt.


No sir.

The only mark is the "M4" above the port.
Link Posted: 11/18/2008 2:31:43 PM EDT
Originally Posted By Leg:
Is their a proof mark by the front of the ejection port?  Should look like a C within a square, if that's there than it's definately Colt.


The proof marks will only be present on receivers that where sold as part of a complete firearm.  They will not be present on a receiver sold as part of an upper conversion, or as just a component, as in the OP's case.





Link Posted: 11/22/2008 7:23:26 AM EDT
just looked at my new 6721 has c and keyhole stamped to the rear of eject port so maybe they stamp in diff. loactions
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