I have been shooting my full size M&P 45 for several years with the stock trigger and never was able too shoot it as accurate as any of my others including the Shield 9. I put a new Apex sear in it today and it is like a new and better gun. I didn't buy the kit I only changed the sear I can see no reason to do anything else to it now. If anyone else is like me and living with the bad factory trigger, go ahead and change the sear you will be happy you did.