Hi,
Well that article is sort of misleading since there has been no weapon system chosen to receive the awarded contract status yet.
The Mk48 Mod 2 would have to be revised in a few areas to handle the high pressure cartridge systems the Next Generation Squad Weapon is required to handle/operate at. In its' current state the Mk48 Mod 2 is not designed/built to handle the high pressure from the new cartridges.
The high pressure ammunition is a separate solicitation/tender and eventually awarded contract.
Sincerely,
Theis