The feeder/delinker of a Gatling gun is provided with an access system which includes a unitary access door and a plunger mounted in the access door. When the access door is partially opened, the plunger is deployed and contacts and secures a cartridge in the feeder/delinker so that a user can remove his hand from the feeder/delinker prior to completely closing the access door. When the access door is closed, the plunger retracts into and is stored in the access door.