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.