It appears that Colt has rebranded the AR-15A4 to align with its new ‘CR’ series of rifles and carbines. The CR6700A4 becomes the 5th addition in the CR series following the CR6920, CR6920MPS-B, CR6920 EPR, and CR6940.

Here is an image showing the CR6700A4 on Lipsey’s website.

I imagine we will see them for sale soon.