The SOPMOD (Special Operations Peculiar MODification) is the collective term for a set of attachments used primarily for the M4A1, usually containing a Red Dot Sight, an AN/PEQ-2A laser module, a silencer and a M203 grenade launcher. The SOPMOD in-game is used by the Special Air Service, Task Force 141, and rarely by the U.S. Army Rangers. The SOPMOD variant of the M4A1 appears in the singleplayer campaigns of Call of Duty 4: Modern Warfare and Call of Duty: Modern Warfare 2.