The Armat Battlefield Systems M-39 submachinegun. Occasionally carried by light-infantry, scouts, engineers and medics. A lightweight, lower calibre alternative to the various Pulse weapons used the USCM. Fires 10x20mm rounds out of 48 round magazines. No movement speed penalty while wielded.
The M39 uses 10x20mm SMG rounds, and holds 48 bullets with an optional 3-round burst fire mode.