blowback

Most blowback semiautos do have an extractor, its purpose is to remove unfired cartridges from the chamber for unloading.

Blowbacks are limited to smaller-caliber, less powerful pistols because the slide/bolt needs to be sufficiently heavy to balance the pressure generated by the cartridge to keep the mechanism from opening fully before the bullet exits the muzzle and the pressure can drop to a safe level (to prevent the shooter from getting a faceful of hot gas and powder residue).

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In my experience, semiauto pistols operating on the straight blowback principle tend to have more felt recoil than the strict mathematical calculation would suggest.