Here's an interesting picture of a M40A5 with a Nightforce. Probably a Mk13 Mod 7 scope?
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It might be the 5-25x56 ATACR, it appears to have a capped windage knob with the cap removed. The turret markings are also the same. Some Marines uses the old NF NXS on A3's, but but since this is a shooting team A5, they would want the newest, best stuff, so the new 5-25x ATACR's make sense. I could be wromg, so if someone has other information, please correct me. I don't know the shooting team guns like I do the rest of the M40xx series.
Here's something most people don't know. Since that's a USMC shooting team M40A5, more than likely it's chambered in 6.5 Creedmoor, not 7.62x51.
Here's a contract overrun USMC NightForce Mil-Spec ATACR 5-25x56 scope on my Mk13 Mod 7. Notice how it has the same features as the scope in the other photo.
Compare that with a NF Mil-Spec NXS 3.5-15x50. Obviously they had different turret markings on the NXS series, but the scope in the photo looks like it's an ATACR.
Are there any photos floating around of the USMC shooting team's M40A6 builds? They actually welded the A6 RACS chassis so that the buttstock can never be shut and so that any other piece that could move no longer does. And the chassis is cerakoted gray, the barreled action is cerakoted a burnt bronze color or something similar. It's an awesome looking rifle!