The FN F2000 is an individual 5.56mm weapon system, developed at the turn of the 21st century by the Belgian armament manufacturer Fabrique Nationale (FN) of Herstal. The F2000 made its debut in March 2001 at the IDEX defense exhibition held in Abu Dhabi, in the United Arab Emirates.
Terminator franchise
T-600 with F-2000.
In Terminator Salvation, while John Connor infiltrates Skynet's base, a T-600 on patrol can be briefly seen carrying the weapon in one hand.
References
The majority of this article is copied-&-pasted from Wikipedia