LEM/DAK DA/SA?
I'm not sure what you guys are referring to when you say the LEM or DAK "in SA" or "in DA." If you're referring to the "initial" trigger pull and then the "reset" trigger pull for follow-up shots then I understand. Use of the terms DA/SA on what are essentially both DAO guns is misleading and confusing. Both are essentially DAO triggers, unless you are referring to the double strike capability, which happens after a misfire, and then the trigger pull is significantly heavier, at least w/ the LEM.
The LEM is a double action only trigger pull w/ a long first round pull where the weight is almost nonexistant until the trigger reaches, after about an inch or so of pull, a stacking point. From that point forward the pull is one of three available weights, around 8 pounds, around 7 pounds and around 5 pounds. Once the shot is fired the reset is very short, not nearly as long as the initial pull, but the weight of the pull remains exactly the same. There is no SA or DA change. Always the same. From what I refer to as the stacking point the trigger pull is similar to an SA trigger, fairly light and fairly short, but its not an SA trigger.
The DAK is similar although has some features that make it different. One available pull is exactly like a fairly light double action revolver trigger pull, similar to a nicely tuned Colt Python, long and about 6.5 pounds. The (in my view) odd part is the reset. The DAK has two possible reset options. The first is to let the trigger return all the way to the starting point, as one would with a double action revolver trigger, and then pull again. Its long and a consistent 6.5 pounds. The other option is a fairly short reset, similar to the LEM, but the weight of the pull changes from the initial pull of 6.5 pounds to a "short reset" pull of about 8.5 pounds. Again, sort of odd in my view.
I have the light (approx 5 pounds) LEM trigger on the 5 H&K handguns I own (USP9f, USP9c, USP45c, P2000 and P2000SK). I have shot many thousands of rounds out of them and think it is the cat's meow of DAO triggers. I have dry fired the 229 DAK that a Postal Inspector friend of mine carries as his duty gun. I think its nice, especially if you allow the full length reset for a consistent 6.5 pound pull, but it seems that it would be slower for follow up shots. I also think using the shorter reset w/ the heavier 8.5 pound pull would have an adverse effect on accuracy, but who knows. Its just odd to have a lighter first round pull and then a shorter, heavier follow-up shot. As my friend the postal inspector said, I'd rather have the LEM but I don't feel bad carrying the DAK.
BTW, after thousands of rounds through LEM guns I find the LEM to be VERY consistent in pull and break. I find that to be one of the greatest benefits. Always breaks the same weight and the same place. I think the DAK, w/ its two possible reset trigger pulls, the long at 6.5 pounds and the short at 8.5 pounds would be something I describe as inconsistent. Again I like it, just not as much as a LEM. FWIW.