I think has to be from Sanchez Machine and unfortunately I'm not so sure he's doing business anymore? I tried to put a different kit on my SM-1 a while ago and realized the position of the flat on the auto-trigger pin is different from others. If it makes you feel better though, I got it and I never use it because in order for it to work well the trigger pull becomes total garbage. So, I just keep it for looks now lol.
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