Derrick, we don't know if Flues or NID but for the sake of argument I got my 1917 Flues 4e SBT 32" out and ran the mic down its gullet. No question this one is straight taper. Bore is .726" and needle starts moving at approx. 4" from muzzle, moves at consistent rate to .698" for 28 pts. of constriction. Obviously, I can't attest to the choke's originality but previous owner(s)had not reduced, removed, or otherwise dug into what is a pretty wide shadow-line cheekpiece so it might be unchanged except that it seems a bit open for handicap yardage. You never know; some are less worn and tinkered than others. Not every shooter at trap conforms to Chop's notorious sterotype of the trapshooter.
jack
