The Mk 18 Mod 0 is a M4 or M16 with a Close Quarter Battle Receiver (CQBR) instead of the original upper receiver. This allowed for a firearm the size of a submachine gun with the ability of firing a rifle cartridge. The receiver, developed by the U.S Navy, shortens the barrel to 10.3 in (262 mm) making it easier to maneuver in and around vehicles or tight spaces.

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