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Thread Pitches: 13.5LH vs. 1/2×28 | Allen Arms Tactical
Dear silencer lovers, I am going to clue you in to a little secret; you’re probably not going to like it but hear me out. When it comes to 9MM thread pitches for handguns the European standard of M13.
allenarmstactical.com
I went back 3+ years in the threads (pun intended) and I didn't see anything in the titles on this, so I am going to post it here to see what the forum members think.
I have a couple threaded barrels on my SIGs, which I assume are M13.5x1LH - I have not checked them - I didn't think about it at the time. I came across an for sale ad for a slightly used SilencerCo barrel and started to dig into the specifics and came across this article.