The original breeching washer I bought from Tom Heller, for installing a "long" threaded barrel into a short frame, measures 2.60 mm or 0.101".
It is reportedly an original washer: I can't imagine they would leave it that much longer than required.
Tom?
I was not able to try it out, as my "long" threaded barrel would not turn into the receiver I was trying. I need one of those thread chasers!
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