I’ve been curious about the Mcarbo kit, I recently used one on my Taurus PT99, extremely good results. Triggershims.com also sells a complete spring/shims kit. But you have to measure what size shims you need with a feeler gauge before you order. This may be the problem with the Mcarbo kit, possibly the shims are too thick and causing some binding. My GP is so butter smooth it’s just plain sweet, now if I could only fix the false reset but so far nothing happening there. I just have to remember to go full trigger reset, unfortunately I’ve picked up the bad habit of feeling the reset on my semi autos so I unconsciously pull the trigger on the tiny false reset of the GP. I pretty much do all my shooting with any handguns rapid fire whether DA in a revolver or DA,SA with semi autos, so the false reset is a bit of an issue for me.