Stock because it's free.
Bolts don't make enough of a difference to warrant $50+. Seems to be a fad item that gets popular every 5 years or so, I remember when I first started playing Eclipse was coming out with all of their 87 cocker bolts and plenty of companies were promising all sorts of fantastic gains. Empirical testing showed most of them to either be false or so minimal as to not be worth it. We've come back to "wonderbolts" again and again empirical testing has shown most of them don't do that much.
LP poppit is a better use of the money, but even that a lot of people say doesn't make a huge amount of difference. I'd just leave your gun stock unless there is something specific you don't like about it. Throwing money at it just to throw money at it isn't going to do anything for you.
This line is in remembrance of Jared Wilson, friend and paintball teammate who died on 7/27/2005.
My Old Feedback +1/-0