I have a 4013 that I am unable to figure out. The trigger pull in DA is smooth. On SA, the first 1/32" of the trigger pull there is a click and it feels like something is slipping into place. The trigger pull on my 4013 TSW is nice and smooth. I removed the grips and the slide to look inside the frame. It appears that the trigger bar jumps up into place on the trigger when you pull. It is only in SA and only the first part of the trigger pull. Is my trigger bar worn and drops down or is the trigger itself worn and allows the trigger bar to drop. Then when you pull the trigger, it jumps back into place. Could the plunder spring be worn enough to not keep the trigger up in place? Any advice or help is appreciated.

I think your trigger play spring is either bent or broken. It is allowing the hooks on the top of the trigger to slip out of the groove in the head of the drawbar when the hammer is cocked for a single action pull. When you first start to pull the trigger, the hooks on either side of the drawbar head slide back into the groove and gives you that "click". The trigger and drawbar are then connected as they should be and the gun will fire, although the trigger may feel spongy. To check this theory, take the slide assembly off your frame, and watch the area where the hooks on the top of the trigger ride on the front (head) of the drawbar. If the trigger play spring is not working properly, you will see the hooks ride up out of the groove when you cock the hammer back manually. You will also hear the "click" when you first start to put pressure on the trigger.

The trigger play spring is riveted to the top, front portion of the drawbar. It puts spring tension against the rear of the hooks on the top of your trigger and keeps it engaged with the drawbar. If it does not appear broken, bending it forward may help your problem. If it is broken, and needs replaced, you will have to detail strip the pistol and take the drawbar out of the frame. The rivet can be punched out of the drawbar (bottom to top) with a small punch. The spring then falls off, and a new spring (S&W# 104440000) can be installed, along with a new rivet (S&W# 068770000) and a good peening. If you are not that familiar with the 3rd Gen autos, it is suggested that you have a professional gunsmith take a look at it. Because there is a chance that it could also be the trigger itself, or the drawbar, but a broken spring is usually how you get the "click".

My trigger bar does drop down and that is what is making the click. The spring does not appear to be broken.

Problem fixed. Part of the problem was the grips. They were for a double stack gun. Changed the grip to a stock grip and problem was solved. Thanks for the help. Also did a detailed cleaning while everything was apart.