I too must give mad props to the Eigenbarrel! DP FX with NDZ bolt & LAW ram and I've not had a break up barrel and my shot counter is around 15,000! Only breaks have been at the tip from dirt/debris!
I have 3 other barrels that are .686, .689, & .691 and I really haven't used them in a long time.
Just played a tourney yesterday and ended up leaving with more paint than I came with
so I will be doing a FPS test with all my upgrades (doing individual fps increases and combined).