It's a great barrel, if you have good paint (I recommend bombs) it shoots like a dream. I have had shots that hit and break at up to 200 feet! However don't use it anywhere above 280 fps, then things get bad
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2 of 2 people found the following review helpful:
Barrels alright, check your paint!
May 30, 2011
Reviewer:
Troy Jones
from Henderson, NV United States
Barrel shoots fine, difficult to use when navigating tight corridors, sticks out like a sore thumb. If you want accuracy, in my opinion, buy good quality paint. I shot middle of the road paint through it and it flew every which direction. Then put some EVIL paint through it and achieved better accuracy. I then switched to my stock barrel and it shot straight too. A lot of money for not big results.
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7 of 8 people found the following review helpful:
good barrels...
February 3, 2009
Reviewer:
dori-KIN
from american canyon, CA United States
pretty happy with this kit. had alot of improvements when i used this kit for my x7. had the Flatliner before, so i saw an immediate improvement in terms of accuracy at about or close too the range of the Flatliner. a couple of issues i have about the Straightline is that it doesn't come with the .690 fin which is the only one you would really need. and the muzzle seems to chop the paintballs. i would have about 2 to 3 chops withing shooting about 200 to 300 rounds. no problem tho when i take the muzzle off...oh well, the rifling does work well, marker just needs to be tuned properly to shoot around 280-290 fps consistently. one of the more expensive barrels out there, but well worth the buy IMO...
phenom 
Barrels alright, check your paint! 
good barrels...