XM22

The XM22, also known as the Stoner 63, is an American light machine gun designed by Eugene Stoner, L. James Sullivan and Robert Fremont in 1963. The XM22 was a developmental weapon issued in limited numbers to United States Navy SEALs during the Vietnam conflict. It used a 5.56x45mm NATO cartridge with a belt-fed feed system and had a rate of fire of 700-1000 rounds per minute and an effectives range of between 200-1100 meters.

Battlefield: Bad Company 2: Vietnam
In Battlefield: Bad Company 2: Vietnam, the XM22 is the first light machine gun issued to the Medic kit. It seems to perform much like the M249 in the full game, with its 200-round capacity and high rate of fire. It also has the same firing sound.