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Hey i have just been wondering why the walther P99 40 cals have a longer slide. It almost looks broken or wrong. The SW99 in 40 doesn't have a longer slide. Anybody know whats up?
 

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Are you asking why .40 S&W P99 doesn't have the metal machined away in the front?

If so, that has to deal with weight and slide velocity.  When semi-auto pistols function, it's sort of a ballet of moving parts.  In part, the slide's weight determines how fast it travels rearward and forward when the action is cycled by a bullet going off.  If the slide is too light, it will move too fast and you will not be able to reliably eject spent casings.  -You wouldn't want a series of stove-pipe jams.  If you were to examine the .40 S&W variant of the Browning Hi-Power you would find that it too has a little extra weight and is slightly larger so that it will cycle reliably.

If you want to look at a gun where this has really come into play in a very noticeable way, check out the Glock 37.  You'll see a slide that is slightly oversized and scalloped.
 
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