The changes between the three generations of the HS 2000 are minor cosmetic changes. All internal components are the same in all three generations.

Generation 2: Military / Police Version
The accessory rail was added, rear serrations on each side of the slide were cut deeper and wider, and the texturing or stippling on the grip was changed.

Generation 3: Same as Generation 2, with three groves/serrations on each side of the the slide on the muzzle end, to allow easy retraction of the slide to inspect the chamber.
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