DPM Systems MS-EM/1:

Vratná pružina DPM pro EMTAN Ramon 4.02" Barrel

The longer spring (more coils) is stronger and has a heavier pound rating than the shorter spring.

Power Rates

Slide on the battery (idle position):

        Short Spring: 8 lbs
        Medium Spring: 9 lbs
        Medium-Long Spring: 10 lbs
        Long External Spring: 11 lbs

Total force of the system (slide full open position): 24 lbs