If they were selling so well, they wouldn't be dropped. Models and chamberings come and go as they cannot realistically keep each and every one in production all the time, even while using Lean manufacturing as they do. Notice there's additions to the other #1's lines though. let those ride the wave and when demand dictates, the 1B will return. Plenty out there already so it's not as though those that want one can't find one.
Heck, lots have been removed from the catalog and continued to ship afterwards (some #1B's recently shipped
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