I've been wanting to upgrade my p-07 with a CGW Pro kit since I got it last year but right now I can't afford almost $250 for the CGW kit, but I can afford $25 for the MCarbo kit. I'm just curious to know if anyone has actually installed the MCarbo kit in their p-07, or p-09, and how well it worked and what the results were as far as trigger pull weights, both DA and SA, before and after install.
I have no experience with the MCarbo kit. I have run a variety of CGW parts in two P-07's which are both 100% reliable with the ammo I use for practice and self-defense. You don't have to buy the full $250 kit. If I had a stock P-07 or P-09 and wanted to improve it for cheap with CGW parts, I would go with the following:
RP-FPBS Reduced Power Plunger Spring $5.00
97041 Firing Pin Spring $5.00
61100 Firing Pin Retaining Pin $5.00
#15 Hammer Spring $7.00
Reduced Power Trigger Return Spring $7.00
So for $29 you should end up with significantly lighter DA pull (hammer spring, plunger spring, TRS) , slightly lighter SA pull (plunger spring), and a more reliable gun (FPRP, TRS) that will hopefully still go bang with your ammo (FPS to compensate for lighter hammer spring). Once installed, you will need to test this in your gun with the ammo you use, especially the ammo you carry.
This is what I carry in both of my P-07's, but I also run the CGW hammer, DA roller, and extra heavy sear spring for a crisp 3.5 lb SA, smooth DA around 7-8 lb, and 100% reliability with the ammo I shoot. These improvements cost a lot ($113) compared to the $29 worth of springs and pin identified above. Without the hammer and DA roller, you will still have creep in your SA pull, and your DA pull won't be as smooth, but it will still be a major improvement over stock. The extra heavy sear spring guarantees reliability of the CGW hammer and actually increases the trigger pull a bit.
In my opinion, you don't need the SRK, extended firing pin, or custom trigger unless you are setting your gun up for competition with an even lighter hammer spring, trying to reduce all trigger slop and overtravel as much as possible, etc.