Is it me?
I have an old trade in P226 .40, and recently decided it's be a good woods gun cause they're (in my eyes) to hell and back pistols, and of the big three pistol cals (9mm, .40, and .45), I think .40 would be my choice on bear with arguably the best energy and penetration .

Well anyway, in looking for holsters and such, I stumbled upon a flat trigger on eBay for $40 made by Shepard Tactical.
Installed it tonight, and it feels very nice BUT it's not working in Double Action .

I looked all over the site and can't find anything about it being an SAO trigger. I ultimately emailed the company to ask, but I'm wondering if I did something wrong.
I watched videos and looked at diagrams but I can't tell what I did.

Any ideas?

So trigger has 2 limiter set screws. I'm assuming they were preventing the trigger bar from lining up correctly. Removed them and installed with no problem.

Any pictures?

Did you replace the rear of the trigger bar spring in the correct spot? Like the above said, pics would be really helpful to see what you have going on.