| The basic addition is a 3rd sear. It connects to the primary, just like the 2nd, except the articulation is different in that it pulls during the release.
Like you said, everything is pretty much the same, though with the Double-Trouble, they also made the trigger pull itself much longer. The reason was the return spring was made EXTREMELY heavy. Basically, heavy enough to release the primary sear on spring-power alone.
That means when you pull the trigger, you have to push against that sear, doubling the force required to pull the trigger. To minimize that, they increase the trigger pull, increasing leverage, and decreasing the effort required.
The obvious question is, if you are going to modify the stock trigger, is there room in there to add a 3rd sear, plus linkage, and a much beefier return spring?
Looking at the stock trigger, there seems to definetly be room, if you trim the primary sear a bit to make room for the 3rd sear. Perhaps right next to the 2nd sear. There is already a notch. You could just enlarge it enough to hold the 3rd sear. Connect the 3rd sear to the opposite pivot point so that it goes up, while the 2nd is going down, etc.
nick
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