The most commonly known Kalashnikov weapon, so called because of the designer Mikhail Kalashnikov, the AK-47 is **not** used as a matter of course by US Special Forces. The M4 carbine or M16 rifle is currently the preferred choice, although it is on a long list of weapons.
However, that is not to say that special forces are not trained in the use of the AK-47 or may pick it up as the circumstances dictate.
!US Special Forces, AK-47 Training
> Special Forces training includes becoming familiar with the various weapons used by the enemy, including the ubiquitous Kalashnikov. U.S. Army Photo by Specialist David Gunn
Source: American Special Ops