I bought a 6400C back during the stupid AW ban and that thing still runs like a Singer sewing machine!! It is truly a fine "almost-true Colt" M4 for those that think Colt is G-D. Mine came with that ridiculous muzzle brake too. In my opinion, that is the number one reason not to get one now that you have the choice between it and a 6920.
That said, I had the brake removed, a phantom put in its place and added a Magpul CTR and I will never get rid of that rifle. If I could have a bought a 6920 for just a couple $100 more back then I would've though.


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Good point - could removing the crappy brake diminish the value of the rifle since it's not in its original configuration. . . . not that it's being sold in my lifetime but it'd be nice to know.

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