The NID's are even a great value in 16 and 20's. The 28 and .410 tend to be very pricey. I have picked up grade 2 and 3 20's in good to very good condition for a lot less than I could find even a Sterlingworth 20.

My best buy was a 16 field grade in 99% condition that someone had cut the barrels from 28" down to 27 1/2". I guess the end of the barrels got dinged or damaged and the "gunsmith" whacked off half an inch to fix the problem. The bob job was done fairly well and with a little revision is not detectable otherwise than the odd barrel length. The chokes are even perfect. For what I paid you could not even find a Crescent or Lefever Special in beater shape.