I've used many different types of paint,and my barrel doesnt hurt the shot.
Weakness?I don't seem to know of any.
I've used this barrel for 3 months,and it's broken ONE ball. I've gone thru diablos,PMI's,severes,brass eagles,marbilizers,over 1200 balls and ONE break. Some people complain of it being loud. Trust me, it dims down the noise. They just might've never used anything else. I'm also reading of how hard it is to clean. Nope. Pull your squeegee through and you're ready to go. It's especially easy with the battle swab. The price is nice. I'm not completely sure on the rifling, but this barrel does the job right. I went out just this weekend and took out 9 games in a game concealed in the bushes. 5 were one shot kills from a good distance.
Sweet barrel if you know what you're doing. Good barrel from a good brand. Always fear the man with an Armson(unless you encounter him from behind)