[m14brian]

I say its "always" good to have spare parts kicking around,,so with that said,,get the extras and stash them and shoot the original parts till they fail,,,(years & years & thousands of rounds ) or wear out or go out of Spec. then change them as needed !!! GI1

Excellent advice! If I may add, don't forget to restock your spare parts bin after you take from it, keep it fully stocked. You just never know.
m14brian