Well i got a JCS aluminum tube and boy I will tell you
I got at least 1000 more shots off my 20oz tank
Even with the stock barrel i got at least 50 more feet and my velocity went up 20%
With my Egrip i could crank out at least 40bps at max setting.
It actually made my paintballs "home n on my targets" perfect for those awesome blindfire and trick shots.
All in all I recommend the stock tube and bolt unless it breaks then get the JCS tube, for the afore mentioned reasons of course.
Kingmann Hammer PLUS