Bolt open device in action
These rifles have a bolt hold open which is a mechanical device built into the receiver. There is a lug that slides through the receiver center support, it is spring loaded & has a "foot" on the bottom, when the mag is empty the floorplate contacts & raises the "foot" pushing the lug up in front of the bolt face as shown here. The only other AK type actions that have hold opens are the Yugo & some Chinese models although these aren't actually "devices", they use a raised ridge on the rear of the mag cartridge follower to hold open the bolt, the device is part of the mag not the rifle.
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