I just recently installed an Apex Polymer FSS kit and in the kit, I received two trigger springs. One was green and is heavy and the other is silver and is a medium spring. The kit description indicated I should get 5.5 lb if you install the green and a 4.5 lb trigger if you install the silver. I called Apex and their support suggested that If I wanted lighter (4 ish?) I could leave the stock trigger return spring in but there's another option. You can order the competition trigger return spring by itself and get yourself down even lower. I've ordered the competition spring but I haven't installed it yet. I will report back the actual poundage I observe after i install the springs and I'll use my trigger scale to measure both the stock and the competition spring. For reference, my initial trigger pull was 6.5 and went to 5.5 after installing all parts of the Apex kit (excluding the RAM spring) with the silver trigger return spring.
NOTE: I ended up ordering the RAM because installing the kit actually made my reset quieter, softer, and less noticeable than the stock trigger reset. I'll be installing that with the spring from the FSS kit when I swap out my trigger spring.
