I wonder where all of those black rifles will end up!
I'll believe until they day I die that when Sig signed the contract whereby they literally PAY the DOD for every M18 handgun they would take, that it was just to get their foot in the door for the rifle contracts.Big fan of the M16/M4 and variants but yeah, the day they switched, our armed forces have needed/wanted something with a little more punch. They should have gone back to 7.62xsomething ages ago.
As far as weight issues, the 6.8 would be a decent choice. Rifle and ammo both would likely fall somewhere between .556 and 7.62x51. Sensible minds may have thought it best to stick with the AR platform as well. Seems like 6.8 SPC would have been more sensible. After the military adopted the Sig for a sidearm I realized that sensible ain’t on the menu.