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Originally Posted by DSFD506
Can't seem to find anyone that has them in stock. Also is the regular hurricane cylinder kit a bore up one or just an upgraded stock one ? If so that might be why i'm not getting the best out of my spring.
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I have a Pro-Win 7mm in stock.
The Hurricane cylinder kits are a standard bore.
I second the air seal issues. Best way to check is to have your gun unassembled - hold the muzzle of the inner barrel against the air seal nozzle (don't use the other end because the hop up packing's hole presents an area for air seal loss) and with one BB chambered, firing it through a chrony. This method should provide you with the maximum possible velocity with your setup with maximum efficiency and minimal air loss. (Keep in mind that the air seal nozzle will jack forward before it shoots. Keep this in mind so that you don't press the inner barrel against the nozzle too tight.) If you have a huge variance between that velocity with your assembled velocity, then chances are, you are losing air somewhere in the hop up unit. The M4/M16 serious is notorious for having one of the poorest air seals in the hop up chamber. It's even worse if you have a plastic two-piece chamber.
I just built a gun that had a 80fps variance between a good hop up chamber and a poor hop up chamber.