I have replaced all of my firing pins and springs with Dave Tubb's speedlock systems firing pins and springs in all of my Model 700. For one thing the stock firing lock time is 2.6 ms and Dave's is 1.6 ms but that isn't why I always replace them. If you set up your stock 700 on the bench like you are going to fire it but dry fire and watch the crosshairs you will see a jump when the firing pin releases and with Dave Tubb's no jump in the crosshairs at all. I showed this to my gunsmith one time and he didn't believe me until he tried it for himself.