Hello all. I recently installed most of the components of the apex duty/carry kit into my full size m&p 9mm. I've yet to install the ultimate striker block (USB) part of the kit. I ran about thirty dry fires using snap caps and I absolutely love the feel of the trigger now. Very crisp and precise. My question is... How much more can I expect by installing the USB portion of the kit? Is it worth going through the hassle of remove the rear sight?