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In a revolver, there is not an extractor that must "slide" over the cartridge rim. The revolver extractor is an integral part of the cylinder (double action revolver). In a SA revolver there is no extractor per se, and only one method of loading the cylinder. In a semiauto pistol, an extractor must slide or "jump" over the cartridge rim when the slide moves forward. There are theories that the point of impact will differ if the slide is eased forward over a previously seated cartridge vs allowing the slide to strip the cartridge from the magazine, or that extraction will be more certain or reliable if the slide is allowed to move forward stripping the first round from the magazine.
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