Disconnector problem
When this happens, is the hammer in the cocked position? If not, it's sounds like a problem with the disconnector. If that's not working properly, the hammer will not remain cocked as the old round is ejected and a new round chambered. The hammer follows the bolt as it closes after the shot. The disconnector holds the hammer in the cocked position until the trigger is released and the sear is engaged. Any AK expert or competent gunsmith can easily fix the problem.
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