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Vratná pružina DPM pro FN 509 Compact 3.7" & Midsize 4.0" Barrel

The system includes 4 external springs, 2 x 1.0 mm wire diameter and 2 x 1.15mm wire diameter, all with different power rates.

The soft springs are designed to serve threaded barrels and compensator modifications.

**As we lead the evolution of recoil reduction technology, products may change versions (new design with different springs, with or without plugs, washers, etc.) without any prior notice.**

Power Rates

Slide on the battery:

Soft Springs 1.0mm

    Short:  9lbs
    Long:  10lbs

Strong Springs 1.15mm

    Short: 10lbs
    Long:  11lbs

Slide full open position (approx.):

 Soft Springs

    Short: 16lbs
    Long:  17lbs

Strong Springs

    Short: 18lbs
    Long:  20lbs