My Sig Armorer Manuals are packed up in a box from when I closed down my office, so I'm going from memory - I am pretty sure all you had to do was replace the hammer with a DAO hammer and remove the decocking mechanism. Used same trigger bar, sear, etc.
Here is the link to a DAO hammer:
http://www.midwestgunworks.com/page/mgwi/prod/HAMMER-3 Sold out currently.
If you can't find a DAO hammer, all you really need to do is remove the single action notch from the DA/SA hammer. Make sure you leave the safety intercept notch intact.
The DAO trigger is on the left, the DA/SA is on the right - just file/grind. Generally the DAO hammers are bobbed since they aren't to be cocked, if you leaver it unbobbed and cock it back, the safety intercept notch will catch it if you release the hammer. Bob it just to be safe.
Attachment 47220
FWIW: Arik is incorrect about DAK is the post above.
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