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If it's the right thread, I'll take it. Let me get my measurements..... The thread pitch is 20tpi and the diameter is .680" or about 11/16ths.
The outer diameter of MY tailcap (M600), just forward of the knurling, is .790". Does yours match these measurements as seen in your photo I "borrowed"?
Just measure across the tailcap where the red lines are...if it's just a bit over 3/4" then I will assume that the threads are correct. As long as it's genuine Surefire brand.
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