The M4 Carbine's with similar weapons' different Grip Pod Systems, AKA "Grip Pods"  created in 2003 are still used by the American (Include the US Army, USMC, National Guard, US Air Force, FBI, CIA, DEA, Customs Border Patrol, etc), British and Australian armed forces is such a device. The grip may also have a tactical light and the control switches molded into the grip's assembly.
Similar to the M4 Carbine, weapons with distinct Grip Pod Systems created in 2003 are still used by American (US Army, USMC, National Guard, US Air Force, FBI, CIA, DEA, Customs Border Patrol) and British/Australian armed forces. These grips may feature a tactical light and molded control switches.