I purchased what I assumed was a Prometheus, but when I got home I saw nothing to indicate what it was. It came in clear tube with two red end caps, and laser etching on side of barrel says Precise 6.03mmx208mm
Its not a prometheus, its evikes knock off. They are very misleading with their advertising. It may or may not be as good, but from what i saw with the 470mm evike precision barrel i had...it looked very good.
Prometheus barrels do not have any markings on them. Furthermore, they also come in a plastic cover with orange and black cardboard on the back.
Prometheus barrels will generally run you about the $60 mark. If the price seems too good to be true, it likely is.
Also, it was clearly marked Matrix. http://www.evike.com/products/32672/
Evike just used "Prometheus type" to draw you in. Matrix products should never be trusted, as it is Evike's in-house rebranding, taking from the bottom of the barrel from OEMs.