Proteam Micromag with Ricochet AK, Longbow barrel, CP drop foreward and on/off, macroline, nitroduck 68ci 4500psi, dye stickies
Small, high-quality paint
Accurate with the right paint, looks cool, a little quieter than the stock
Bad accuracy with bad paint, can't shoot through a break, paint chips off
This is a very good barrel for improving your accuracy if you know you are going to only shoot excellent paint. The first time I used it was at a big scenario game and I had to use the field paint and balls were initially curving all over the place. After a while I think the balls changed shape and they started shooting great and everything was on target. Basically I learned that everything is great as long as you can precisely match the paint to the barrel. For me this definitely isn't the greatest 'cause I'm on a budget so I ended up buying a lapco bigshot which works much nicer than the armson stealth.
The biggest problem is cleaning. If you get a break for any reason then you'll be shooting all over the place untill you can get a squeegee because the paint gets caught in the rifling and won't come out.
Another issue is the fact that the rifling doesn't really help the paintballs. From tests I've read online and from my personal tests, a spinning paintball does not fly better, it curves. This is because the paintball is filled with fluid (think of a cooked egg vs. a raw one and try to spin each), and because the projectile is not cone-shaped like a bullet. Tippman uses the principle of backspin to make balls curve up, but if the armson rifling really made the balls spin then they would consistantly curve to the side (which happens when you get paint that is too big). What the armson does do is give less friction on the ball as it passes out of the barrel so the rifling doesn't actually make the balls spin.
For people that say one barrel gives more range than another that is just dumb unless you are using a flatline. This barrel will have the same range as a dye boomstick shooting at the same velocity with the same paint.
I also had an issue with how easy the paint chipped off the barrel. I don't know if it's because it was painted as opposed to annodized or what, but this is the only barrel I had that would chip as it does.
If you want to have a cool looking barrel with pretty rifling inside when you look down it, then this may be the barrel for you. If you want to have a barrel that will consistantly give you great performance through all kinds of paint, then go with a lapco or smartparts for the same (or less) money. Though this barrel IS accurate, it's only accurate under ideal circumstances.