Hi everyone.
I planning to buy an upper of Sig P226 Legion 9mm SA only and used it on my P226 Legion 40 S W DA/SA. Is it work or not?
Thanks in advance.

This message has been edited. Last edited by: Andy1972,

If you already own a P226 Legion DA/SA, why do you need a second slide?

I'm a bit confused by what you are trying to accomplish by swapping slides. If you are trying to convert a SIG P226 DA/SA to SAO operation with a slide swap then no, it won't work.

Sorry for the confusion...
My P226 Legion is 40 s w caliber with DA/SA, the one I bought is an upper came off from a p226 Legion 9mm SA only. My question is can I interchange and use that Upper from an SA only on my which is DA/SA.
I know I can interchange an upper with 9mm on an 40 s w frame, it might not reliable but I only use at the range...
Thanks Modern Day Savage for the information.

Ahh ok, so you are trying to do a caliber change using a SAO upper and a DA/SA lower.

I would assume that from a dimensional stand point a P226 slide and frame should mate. But I don't own any SAO SIGs and haven't examined a P226 SAO slide to know if there are any other mechanical differences that would prevent it from working on a DA/SA frame...so I don't know the answer to your question.

If no one is able to answer your question here you might consider referencing a parts diagram and list.

I went to the range in Friday test fire. It works like a normal P226 9mm when I swap the SA upper 9mm on to my Legion 40 S&W caliber. Now I got two calibers in one gun

Thanks for that report. Something good to know.

First time I've read of this being done so thanks for the follow-up!

I swap slides (within a caliber) all the time as some are milled, some have certain sights, etc. DAK/DASA/SAO lower never makes a difference. I have tried doing caliber exchanges only once (9mm to .40 on a DASA lower) and it didn't work. I've heard mostly success stories like this from others but it is possible it won't work.