Price paid: $30.00
Pros: Price, accuracy, excellent value
Cons: I haven't done it myself, but it might be easy to chip. I'm reaching here.
Let me start by saying that these barrels are absolutely amazing. I have one on almost every marker I own. I don't think you are not going to find a better bang for your buck. Other barrels may cost you 2 or 3x more. I feel that you can't go wrong for $30 bucks.
The claim of these barrels being self cleaning is absolutely true. We all know how much it sucks to have a barrel break in the middle of a fire fight. If you have on one of these barrels, you'll have no worries. You can keep on firing, and the barrel will fight on through. The first few shots may curve, but it will fix itself very quickly. Obviously you're still going to want to clean it out when you get the chance.
This barrel is usually one of the first things I buy when I get a new marker. I feel for the price that they simply can't be beat. I would recommend one for sure. If you buy one, I don't think you'll be disappointed.
I understand that my review may sound biased, but the truth is that if I didn't think something was great, I wouldn't say it is. I'm not a person who thinks everything I buy is awesome. Sometimes you buy something and it's a total miss. It sucks, and you're disappointed in yourself for even wasting the dough on it. We've all been there. Other times you get something and it works out great for you. For me, the J&J barrel is one of those things.