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 mid-range spring ideal for general medium FPS field setups (around 350) and short stroked low FPS CQB setups.
Wire gauge: 1.37mm (.054in)
UASR rating: 3.61L
Spring rate (6kg test): 647N/m
Spring length: 183mm
More information on UASR ratings here and here.
This product was added to our catalog on Tuesday 10 September, 2013.