A5 LPK, Air Ameraica 68/4500,Flatline,Bigshot, Ion
Color coded, able to fine tune
After installing my low pressure kit i started having all kinds of velocity problems. I even purchase a R.V.A. in an attempt get the f.p.s. up. I was at 750 p.s.i. to get 280. Got the spring kit stuck the red in and i'm good to go. Running marker @ 450 p.s.i. now.
If you are having problems with your velocity get them, otherwise I wouldn't see the point in getting them unless you love to tinker with your marker.