Hitman Paintball's Barrel Test
Hitman Paintball, formally a milsim paintball store in Canada, is in the midst of running an extensive barrel test. The driving force behind Hitman and the barrel test itself is one Stan Boudreau. At the time of his last post, he had 16 companies sending barrels to him for the test. Should he finish the test, it will be a nice compendium of the properties of many different barrels.
If you are interested in getting a barrel you produce submitted for review, check out his contact information on the blog post.
An older video made by Stan that has a prodigious number of views on Youtube: