Soldier Systems Daily is covering AUSA now and SIG unveiled their candidate for US Army's NGSW( Next Generation Squad Weapon) program. The program consists of two guns that will replace the M249 SAW and M4, but shoots a caliber in 6.8mm family.
The replacement for M4 will be NGSW-R while for M249 is NGSW-AR
http://soldiersystems.net/2018/10/08/ausa-18-sig-sauer-unveils-belt-fed-machine-gun-carbine-and-hybrid-ammunition-next-generation-squad-weapon-candidates/
Sig also unveiled hybrid ammunition that uses different metals.
