smart parts non-vision impulse
-shocktech supafly bolt
-ndz blade trigger
-smart parts lpr
PROS->ACCURACY-this is easily the most accurate barrel i have ever used
2 PIECE- no third peice to dent
6 BORES- there are six different bore sizes
CONS->BREAKS- it doesn't shoot through breaks very well
O-RINGS- i went to take the two pieces apart and they wouldn't budge. I had too use 2 wretches to get them apart(put belts between them and barrel so it didn't get scratched) you have to be really careful not to put them together too tight. Not a big deal though. Then there is no o-ring on any of the backs so they come loose every once in a while. Not a big deal though I just took the one from my progressive.
This is a great barrel. I would recomend this barrel to anyone.