AK bolts don't lock to the rear. Remember the Sandy Hook video of the cop trying to lock back the SAIGA shotgun and he couldn't figure out how to do it? He finally just gave up.
Open bolt designs(Like the TEC9s and Ingrams, MAC-10 knockoffs, etc), fire from an open bolt meaning to cock them you pull the bolt to the rear where they engage the sear and don't go forward until you pull the trigger. In fact, most have a firing pin that is actually milled from the front face of the bolt face and as the bolt travels forward striping a round from the mag, and seating the round into the chamber, the firing pin strikes the primer almost simultaneously and starts the bolt back toward the rear to repeat the cycle.
Open bolt designs were specifically created for machine pistols and an open bolt design on a semi-automatic weapon are actually an unnatural modification of the original design principle.