Quote:
Originally Posted by safx
Good luck with this, I've built a FMU Patriot
and owned that very same ICS M4 pistol and
the fps wasn't what they listed on that site.
As expected and said many times already—
you can get to 320fps but it's tricky business
when your dealing with such a shorty barrel.
Too much air to push and the bb exits without
reaching top speed. So you'll be finding the
balance between air volume/ length and
strength of spring is a bitch. Colin_S told me
about PDI springs being physically shorter
so they could reach expansion faster. I would
take his advice and the Guarder MP5K kit
plus a couple PDI springs.
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Thanks a lot for the info about the PDI springs. That's a big help.
EDIT: Also, using regular pitch (as opposed to the traditional irregular pitch) springs will cause the spring to expand at a constant rate throughout the duration of it's expansion. Irregular pitch springs are designed to get increased spring expansion near the end of it's cycle, which for short barrel users, is too late at the bb has already exited the barrel.