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kle
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>>355806 in your gif, it does...but it only moves back a little bit. It's locked with the slide while the bullet is travelling down the barrel to maintain pressure (if it ejected the case right away, you'd lose muzzle velocity/energy and thus lose range). After the bullet has left the barrel and is no longer under pressure from the propellant gasses, THEN does the barrel unlock from the slide (it tilts down slightly) and the spent casing is extracted and ejected by the recoiling slide.
I think the Beretta 92 uses a slightly different locking system, with no tilting, but the idea is the same: keep the slide and the barrel locked together while the bullet is travelling down the barrel, and only unlock and eject the case when the bullet is out of the gun.
http://en.wikipedia.org/wiki/Recoil_action
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