Those chokes may very well be original . My 12 ga WW Greener has 30" cyl/cyl as does my Scottish 20 ga with 30" cyl/cy/.
Are those fluid steel or damascus barrels?
Hopefully someone with more mettalurgical knowledge will weigh in. The English had no problems altering guns to fit their needs. My first Parker a 1 frame VH 16 had its chambers lengthened back in the 1980's.
I have 11 16 ga's, most with short chambers so I've loaded short 16's for years.
__________________
"How kind it is that most of us will never know when we have fired our last shot"--Nash Buckingham
|