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From my understanding, the Cylinder choke is the same as a straight bore.
Chokes are also more than just a change in ID. Some chokes will just taper down (conical), some will step down (beginning and end of choke cylindrical, middle part is conical). There may be other choke geometry I can't recall at this time.
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"Ray guns don't vaporize Zorbonians, Zorbonians vaporize Zorbonians" The Far Side
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