Re: aftermarket bolt spring,shroud,firing pin
I also have used many Gre-Tan firing pin and bolt shroud assembly's. they are a very nice addition to a Rem700, but not mandatory unless you have a J-Lock debacle, then it is a "must have". If you have a brand new "post J-Lock" you might be wasting your time because the new stuff I have seen is good.
It takes 43 muscle's to frown and 17 to smile, but only 3 for proper trigger pull.