"How I stopped worrying and learned to love M13.5x1LH"

[The Heretic]

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.

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[solv3nt]

My sig 220 45 barrel isn't LH, but my HK USP 45t is.

 

[Nosferatu]

My MPX is metric LH. I put a 3-lug on it.

 

[ilikegunspdx]

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.

Check arms unlimited they used to have lots of suppressors etc in that thread. B&t suppressors mostly. They were very inexpensive.

 

[Bill Siegle]

One of the reasons I chose the Dead Air Ghost was the interchangeable pistons for different calibers and thread pitches. Modularity is fun I haven't really experienced any + or - with either thread pitch myself. I'm sure the manufacturers have their reasons for each.

 

[pogi]

My 9mm pistols all have 13.5LH treads.