Another half assed explanation...
It's Diameter x T.P.I.
My Ruger is 1/2x28. (half inch diameter threads, 28 turns per inch)
My Sig is 13.5x1 mm (thirteen and a half millimeters diameter, one turn per millimeter)
Also, do not measure from the the outside diameter of the barrel. You measure the O.D. of the threads. I am guessing you have a 9/16x24 threaded barrel. 9/16x24 is a thread pitch used by some manufacturers for .45 acp stuff. My calculator tells me that 9/16 is .5625. If your threads are in fact .61, don't know what it would be.
Hope this helps more than it confuses.
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"9mm has a very long history of being a pointy little bullet moving quickly" --Sevens
Last edited by Willie Lowman; December 16, 2011 at 11:48 AM.
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