Frank, I have measured maybe 6 ws1 chokes in 12 and 20ga model 12 and 21's. They were all bell shaped, but I have not had a 16ga ws1 to check, maybe they are different. I think I read somewhere that Winchester had a patent on the ws1 choke.
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" May you build a ladder to the stars climb on every rung and may you stay forever young "
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