I know this thread is old, and Ive noticed that the trigger group assembly pins can cause the action to seize if they are not completely flush in the areas/channels that the bolt slide rides. This can happen during disassembly and reassembly. I recently stripped my weapon to hone action parts and one of the trigger group pins came out about 1/16th inch. Although the trigger slid back into place easily, the pin was causing the bolt slide to stop. after flushing the pins, the action racked smoothly. Hope this helps anyone with a similar "JAM".
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