These ZCI springs come in stiffnesses from M80 up to M150. Maintaining ZCI's trend of maximizing performance per cost these are just bare springs, removing the cost of packaging and adding shipped expense. No FPS estimate is given because as with all spring ratings there are so many other factors that effect FPS the given value would be almost arbitrary.
A fairly light spring idea for moderately low FPS.
Wire gauge: 1.41mm (.056in)
UASR rating: 3.19L
Spring rate (6kg test): 632N/m
Spring length: 174mm
More information on UASR ratings here and here.
This product was added to our catalog on Tuesday 10 September, 2013.