J&J full tilt
Pyscho ballastics drop
Ans hammer kit
most anything will work
Ability to change lengths and colors
Stainless steel back
Cannot change bore to match paint
Not much else
Great barrel, but kind of hard to come by. The price listed above is not correct you can find a front piece for around 15 and a back piece can be ordered for between 50-60 dollars. The only real problem that I have ever found with this barrel is due to my marker setup. My ram sticks out almost as far as the back piece of the barrel thus making it hard to take the back piece out to squeege. The accuracy of this barrel is completly astonishing. At approximately 20-25 yds I can hit a 12" X 8" sign with every paintball that I fire. That is fine with me.
I like it and have used it on both a spyder flash and now my autococker. Always puts the balls where I need them to go.