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^ What he said.
In a blowback semi-auto pistol or rifle...
The slide or bolt is all the way forward and the round is chambered. There is no "locking" mechanism that locks the action closed briefly while the bullet travels down the barrel.
When you pull the trigger in a blowback, the hammer or striker fires the bullet... then the shear weight of the slide/bolt and the pressure of the recoil spring cause the recoil to not push the bolt back as quickly as the bullet travels out of the barrel. The slide/bolt slides back then starts to go forward again cambering another round then it closes waiting on you to pull the trigger again.
From the outside it looks like a normal pistol, slide forward as normal.
Many machine guns use blowback... mostly the sub machine guns.
They also fire from an open bolt... bolt is locked to the rear, and no round is chambered.
Pulling the trigger allows the bolt to slide forward and it chambers a round as it goes, the fireing pin is built into the bolt, and as the bolt slams closed, it causes the round to fire. It then works like a Blowback to open the bolt, but the bolt stays rearward.
If a pistol fired like that, it would look like the slide was locked back on an empty magazine, and the trigger would release the slide forward and fire a round.
Youtube has videos that explain it better than words on a page.
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