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Old March 24th, 2010, 08:57   #1
Join Date: Mar 2010
Location: Boisbriand, Québec
Spring designation: interpretation.

Hi everyone I am relatively unexperienced with airsoft pieces and upgrades and I was wondering what does the number in the spring designation mean?

I often see things like M120 or M140, I guess it gives information about of the strength of the spring, but how can I have an idea of the fps a certain spring would give?

I searched and I did not find any thread concerning this, but I guess there might be one since it is a pretty important internal…

Thank you… and sorry for the question noobiness.
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