Posted: 1/1/2026 3:00:57 PM EDT
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I have had a DAO Sigpro kicking around and purchased a DA/SA hammerbox for it. In doing research, it looked like just the hammerbox was needed. When I installed the DA/SA hammerbox and function checked the pistol, it is working double action mode only. The hammer will not stay cocked after firing and running the slide. In checking the parts diagram, I don't see anything that I am missing. Does anyone know if there is an additional part that needs to be changed out? |
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I would break it down/take it apart again. It could be that the trigger bar and new sear are not joining properly, the sear and hammer are not aligned correctly and check to see if the hammer pivot pin is not blocking the trigger bar. Go on Youtube and check out some videos of disassembling the Sig Pro hammer box. They have a few there that can be more helpful. |
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