The Nuprol M100 airsoft springs are designed to fit a variety of AEG's
A M100 spring would give you 100m/s, to convert to feet per second (fps) simply multiply by 3.28 (e.g. M110 = 110ms / 360fps.)
This M100 spring should give you an output of approximately 328fps.
We recommend this product is only fitted by experienced or qualified airsoft technicians. Incorrect installation could lead to damage or failure not covered by the warranty.