If my information is correct, the large shank Win. High Wall barrel threads are indentical to the current manuf. CPA/Stevens Model 44 1/2 barrel threads.

     My question is, will the Winchest barrel screw right up to the CPA receiver and be ready to shoot ?  That would mean the two manufacturers would have the same size and location of extractor (the CPA is at 6:00 o'clock); the same shank length ,i.e., head space; etc.

    Has anyone tried this swap or have previously researched the topic ?
If the answere is no, they will not swap w/out modifying work, what is the work needed to be done in order to make the Win. to CPA swap ? 

    Thanks for sharing your experience w/ this problem.

Another thing to keep in mind is that unlike Stevens and Winchester rifles the CPA did not have timed threads till a few years ago. Therefore CPA barrels do not often interchange. I am sure Paul or Gail can tell you when they began to time the threads.
Cheers,
Laurie