FN 509 3.7" Compact & 4" Midsize
B.O.S.S: Black Oxide Stainless Steel - An innovative coating technology applied usually on the visible parts of the recoil system.
FN 509 3.7" Compact & 4" Midsize
FN 509 3.7" Compact & 4" Midsize | Set Spare External Springs
Also Compatible for 509 Series:
Compact Tactical 4.32"
Midsize Tactical 4.5"
DPM Adjustable Mechanical Recoil Reduction System for FN 509 3.7" Compact & 4" Midsize
The OPEN Sping's side must be placed against spring house.
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 mods.
**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
Heavy Springs 1.15mm
- Short: 10lbs
- Long: 11lbs
Slide full open position (approx.):
Soft Springs
- Short: 16lbs
- Long: 17lbs
Heavy Springs
- Short: 18lbs
- Long: 20lbs
Overall Advantages
- Faster follow up shots
- Improved firing speed
- Slide and Frame Protection
- Elimination of jams
- Significant recoil reduction
- Better double-tap concentration
- Better control and greater accuracy
Lifetime Warranty.
Millions of our patented products are in service to military, law enforcement, sports and civilian firearms around the world.
How it works
Made in Greece – EU.
