Knob of bolt handle is not shown. The striker pin is drawn back into the breech bolt cylinder as a result of the camming: action as the bolt handle was lifted.
Pushing the bolt forward will cause its face striking against the base of the cartridge to drive the cartridge forward and chamber it. The extractor movably mounted in the bolt head will snap over the rim of the case ready to extract it on rearward movement. As the bolt handle is turned down to lock into its receiver cut, the turning motion will act through the cam faces on the rear of the bolt cylinder and on the cocking-piece to complete cocking the arm and leave the sear holding the striker in rear position ready for firing.
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