By replacing the Jlock you lessen the possiblity of an accidental discharge, which is why Remington no longer produces rifles with this feature, there is also a less likelyhood of having the key lock lock up .
I have had several Jlocks replaced and the trigger pull seems to be better afterward.
Gretan makes a replacement bolt shroud and firing pin that is affordable and works very well.
The factory spring seems to me, to be a mess, not inline like most of the aftermarket springs, I would think that the distorted spring, if that is correct terminology can not be condusive to great operation.
KK