Russia begins issuing the AK-12 to its armed forces, does the US military also need a new rifle?

The Russian paratroopers have received the new rifles with red dot sights and grenade launchers. Other troops will be issued them later. Since the M4 carbine was first issued in 1994, and is almost as old as the previous Russian AK-74M from 1991, does the US military need a new rifle?
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