I've used a few different kinds of paint with this barrel, and with all of them the performance has been great. Brands I've shot through this barrel are: Stryker, Draxxus and Empire (winter paint).
Great Milsim features.
I first saw this barrel appear on the BTWO site when it was in the final stages of development. Luckily for me it was also around the time when I started looking for a new barrel for my Delta, since I was not pleased with the stock barrel. I was originally looking into Lapco APEX barrels, but once I saw the features that this barrel system offers I decided against going with a Lapco barrel.
The barrel itself is 9" in length, which fits in the hand guard shroud of my Delta perfectly. On top of this you have the various tips that are available both individually and in various packages. I purchased the package that included all of the current tips aside from the APEX itself (still have the tip adapter though). In the future I will be looking into getting an APEX. I currently run my Delta with the 3" extension and the Blaster tip.
The barrel and tips are well made, and can take a beating. During the first game of my season this year (a scenario game in the snow/ice/rain) I used this barrel for the first time and was very pleased with my purchase. The barrel is light and accurate, and it is also very durable. A couple times through that game I found myself hitting the extension and the Blaster tip off of things like trees, a bus and lots of ice and it still looks like the day I got it.
In conclusion, I would recommend this barrel to anyone who is looking for a highly accurate and versatile barrel for their A-5/X7/BT-4 or Autococker threaded marker. This is a great product that has not let me down yet, and I cannot see it letting me down anytime in the future. Well worth the money.