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As the front of the bolt pushes the top round out of the magazine, the bolt's bottom keeps the next round from rising all the way to the top of the magazine. When the gun is fired again, the bolt is pushed backwards. As soon as the bolt face clears the rear of the magazine, the next round is pushed into place by the magazine spring and as the bolt returns to battery, it repeats the process of the bolt face pushing the top round out of the magazine and into the chamber, while the bolt body again holds the next round below the round just chambered, down in the magazine.

You can feel this on most guns when pushing a magazine in place. Try inserting an empty magazine and it will easily click into place, while inserting a full magazine will take some effort because you are compressing the top round further into the magazine as it encounters the bottom of the bolt, further compressing the magazine spring. The same process occurs with semi auto pistols with the pistol slide acting in the same manner as the rifle bolt.
 
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