One could healthily argue that the current inventory we employ was for the COIN environment and we're now returning to the whole 600m-800m section effective range weapon loadout for LSCO without jumping into a whole new intermediate cartridge (which seems to be the play with the remainder of NATO / close partners).
I'd argue that the 600m-800m Section range is actually more of a COIN aspect. LSCO's generally don't have significant range requirements from the Infantry, at least against personnel - Armor yes.
Wouldn't be surprised to see a 7.62 belt fed return to the section in the form of last century's Mk48 or maybe something new and cool like the LAMG, but I might just be optimistic.
I loathe the Mk48, mainly as it's fairly uncontrollable, and any non flow can kills them quickly. SOCOM's AMG Program (if it goes anywhere) will be interesting, as despite it's characterization, it really is a LWGPMG requirement, and the KAC LAMG while a solid gun, doesn't meet some of the sustained fire requirements - but it is propably closest to the mark at this point.
The only way it works is if we got with a carbine length barrel sharpshooter, just recycling the C20 as is would not really meet the reality of the section sharpshooter.
TBH I question the need for a 20" barrel 7.62 gun at all, the original 2004 M110 acceptance results where 2485fps from M118LR, the (allegedly same) M118LR was chrono'ing 2560 and higher from the 16" M110K1 in its acceptance trials with a US Army entity in late 2009. So with powder improvements you can get the same performance one wanted from a 20" with the 16", I'd need to dig out my old data from the 14.5" 7.62 gun, but it was pretty close to the original 20" barrel data - and it was a viable 800m shooter. When I shot the USASOC Sniper Comp in 2015 with the 14.5" gun SGM Sean Wiseman who was the unit Sniper CDD SGM at the time commented I was the only one who actually brought a combat gun to the comp (unsure if that was a compliment or not to this day).
I landed consistent hits at 1,400m at a High Angle Shooting course in Utah with the 16" K1, and while I wouldn't want to guarantee that in combat I know a few folks who got kills out to 1600m with the 16" gun.
My whole point to this sidebar is one needs to have a realistic range band requirement laid out for systems:
Individual Rifle/Carbine needs to be able to ID and Engage Point Targets effectively to X M's with blank percentage probability.
Testing the system is easy - as that can be done in a rest and the ID check for the Optic/VAS can be done easily using items in a field and troops with the setup on a berm - using a Platoon and averaging the results.
Then one needs a shooting program to ensure that the shooter can do that.
The Army determined that the M4A1 can obtain first round hits to 830m with over 90% confidence in a machine rest (target defined as a 18" chest plate). Basically that the stock gun is capable of 2.5 MOA.
However when you add the shooter, the hit results where under 50% at 300m (study wasn't specific as to trades, but only 10th Mnt Div was over 75% at 300m)
And shooter in combat was under 50% at 100m (AWG Mentor group data from Iraq/Afghanistan)
So one has a training/software issue not a hardware issue.