09/03/2026
The Mk 18 CQBR (Close Quarters Battle Receiver) is a compact 5.56mm carbine developed for U.S. special operations and naval forces. Its short configuration makes it particularly suited to close-quarters combat, shipboard operations, and situations where maneuverability is more important than the longer barrel of a standard rifle.
Despite its compact size, the Mk 18 retains the familiar AR-platform controls and uses standard 5.56×45mm NATO ammunition, giving operators a highly maneuverable weapon without requiring a completely different ammunition system. Its distinctive short-barrel configuration has made it one of the recognizable carbines associated with U.S. special operations.