Just buy the decocker lever, decocker spring, da/sa hammer and hammer strut pin then install the new hammer with decocker and spring and you will have a da/sa model. My p226 was a da/sa model that I converted myself to a dao model. It took me about 20 min to take apart and install the new parts and put back together, very easy pistol to work on. There are plenty of detailed YouTube videos that show how to disassemble and assemble the p226 as well if you are not sure.