the stock wgp prostock barrel
progressive barrel kit
stacks up much better than the competition listed
WGP Prostock 04
Empire 4 piece barrel kit
32 Degrees Remote
Empire Reloader OR Ricochet 2kx
Co2 or N2....whichever i feel like using at the moment
PMI Premiums fit the .67 the BEST
Very few breaks
Porting is perfect
Can take a hard beating
Can be hard to take apart
Too long for speedball
This is a great barrel for a great price. I first bought this expecting nothing more than your normal cheapo 4 piece kit, and was proven WRONG! I am VERY happy with the performance. (besides the black barrel looks great on my red prostock). Also, if you decide you need more backs, just buy the different sizes after you've bought the 4 piece kit. After OVER 5000 balls i had broken 1 in the barrel because i short-stroked the trigger. On top of all of this, it is easy to clean, although there will be paint stuck in the porting if you get shot there, or break at the end of the barrel. The accuracy was also holding its own out on the field. I got over 20 outs from about 60 yards away (I understand this also takes a certain amount of talent and practice too) and went through about 2000 balls in one day with around 60-70 outs in the first half(I stopped counting after about 1000 balls). Overall, this is a great barrel, but i don't recommend it for speedball, also, use a rubber canoper/jaropener to take it off if it sticks in place.
I give it a 9 just because i do play a great deal of speedball and need a shorter barrel.
Buy it if you're a recballer, tourney baller, anykindaballer. This is a great all-around kit for a decent price.