I was getting interested in a P226 Legion SAO but then got to shoot an Elite SAO.
I find that I prefer the curved trigger like my CPO P226, but the plain Elite is no longer in the lineup, just a red dot model.

So, how much trouble would it be to put a regular trigger on a Legion?

Call Sig Customer service they will take care of you. I sent one of mine back, and they put a curved trigger in it last year. They will be able to answer all of your questions.

I think it is worth the upgrade to one of these:

https://grayguns.com/product/p...ntermediate-trigger/

https://grayguns.com/product/s...able-curved-trigger/

I have the P-SAIT (top link) in my P226 and couldn't be happier. The dual adjustable one wasn't out when I ordered mine.

If the Legions use standard P-series triggers, it's not hard at all. You would have your choice of Sig standard, short reach, or any of the GGI aftermarket intermediate triggers with single- or dual-adjustable overtravel.

A DA/SA trigger will not work in a SAO. Contact Sig and they will sell you a P226 SAO trigger and you can install it.

I went the opposite route. I have a P226 RX SAO and I swapped the Legion SAO flat trigger it to it. I contacted sig CS and they helped me out.

As of now I've been very happy with the flat triggers on my Legion P 226 SAO, and my P 320 X CARRY, I have several Sigs, and the curved trigger is just fine, but I'm learning to really like the flat trigger and might install them on my other Sigs as well, this is an each your own thing, what ever feels best for you...