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Old September 13th, 2016, 21:17   #13
Bar1975
 
Join Date: Aug 2012
Location: ON
Quote:
Originally Posted by BenG View Post
Sounds more like overspin then PME, you need to use a heavier spring and short stroke the piston to get back down to your desired fps, and revolume your cylinder appropriotly to match the shorter stroke.
I have a Prometheus 407mm inner barrel with a 4/5 cut cylinder...

My field limit is 400FPS so if i add an M120 id imagine my FPS is upwards of 410+ FPS.. (compression is fantastic on this gun right now)

How many teeth would i need to short stroke and what would the resulting Cylinder need be? How exactly do you 'revolume' a cylinder?

NOTE: i have a sorbo pad on the cylinder head as well so already loosing some air volume.
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