The M40's are not commercially available, they are made by the Marine corp armorers, my 2 were built by Mike Lau, Marine corp, armorer, retired. Texas Brigade armory. Mingus TX.
The shooter was engaging to the left of the unit, but probably friendly to us. As I mentioned, the spotter was seeing the counter sniper and unit, and that may be why. Then again, it could be pure hollywood.
TW the spotter is a very good thing, but does not make the corrections using a range finder, he or she should have the same mildot reticle to judge distance as the shooter does, they are both trained in range estimation, and environmental conditions. The spotter is also the protection for the shooter, the shooter is focused on the glass and the target, impervious to anything on his 3, 9, or 6 o'clock.
The spotter has a wider field of view, and the training to keep checking the 6 of the shooter. Also usually has a semi auto.