Sounds to me like it might be rubbing ever so slightly on a couple of base mounting screws. After you have the bolt removed from the weapon. Look at the inside/top of the receiver for one or more of these screws penetrating into the receiver. Use a bright light. Or, if you can, feel with your small finger for the end of a screw through the loading/ejection port of the receiver. If this is the case. pull that screw, file down the needed amount and reinstall to torque specs.
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