The rail and gas system appear to be longer in this version. This version is shown in the colt catalog.
I counted 45 top rail slots.
The other pictures of this rifle that are floating around have only 39 rail slots.
I like the long rail version.
Slings sockets should limit rotation of a QD swivel unlike the 6940's sockets. (This goes for any company making QD swivel mounts)
They list the barrel as 16.1” Heavy, I hope it isn't Colt's HBAR profile.
The catalog gives the following specs:
.308 Win (7.62x51 NATO)
Chromed, 4 Grooves, 1-12” RH Twist
Flip-Up, Adjustable Post for Elevation
Flip-Up, Adjustable for both Windage and
Semi-Auto, Direct Gas System, Locking Bolt