I used a SD3G for a while to see how it performed (both in application and durability) compared to stock GI triggers.
It has some very nice things about it, but it is a different animal with a different application than a stock GI single stage trigger. The trigger characteristics do not give it a hard "edge" to the break, which to me feels a lot like a Glock trigger, you just press through the length of travel with constantly increasing pressure. It works well for the blend of shooting technique in gun games. It has a fast reset (compared to other 2-stage triggers), so very fast splits are possible (about as fast for me as a GI single once I was used to it).
What I found out though was that I can get the same performance from a GI trigger in 99% of my shooting. I am not heavily invested in competitions, I shoot them for fun when the schedule allows. The 1% of my shooting that a good 2-stage trigger shines is long-range (past 300 meters). When doing precision shooting at those distances the hard edge and crisp release of the precision oriented 2-stage triggers allows more precise release, and thus better performance. This applies to more than just leather slinged yellow-glasses wearing gravel bellies in retro-bondage jackets.
I decided to stick with standard GI triggers (especially for instructing/demoing) for my serious guns, but I still have a nice 2-stage for certain applications.


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