Quick Change Barrel Upper Receiver Version D
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Completely compatible with your AR-15 or M16 (small front pin) lower receiver and allows the user to change barrels in just seconds. Allows the system to be extremely compact and concealable as well as giving the operator the option of having multiple barrels for multiple functions. Utilizes standard AR or M16 barrels in any method of operation. Hard coat anodized mil-spec finish, four full-length Picatinny style rails, new locking arm retention system.