about 52 seconds vs 52 weeks plastic internals ? if gears - no f*cking chance metal /plastic nozzle no real difference
Plastic air nozzle seem to be better from what I've heard, alloy ones can cause issues sometimes. Not sure about pistons, but other then that go metal
I'm building one too currently: On of the best prebuilt gearboxes is the ASG Ultimate high speed gearboxes, solid pieces of kit.
Im eyeing up the ones AK2M4 is selling; the ZCI v2 gearboxes i believe. http://www.ak2m4.co.uk/internal-parts/gearboxes-complete Im instantly sold based on the quick change spring system.
plastic internals ?
if gears - no f*cking chance
metal /plastic nozzle no real difference