DPM Recoil Reduction System for FN 509 LS EDGE
Not Yet Rated | Write the First Review SKU: 177-DPM-1000315
UPC: 5213007223159

FN 509 LS Edge Recoil Reduction System (5" Long Slide)

The LS Edge is fast out of the box, but a tuned recoil system makes it feel glued to the target. This multi-spring guide-rod setup controls slide speed, softens the hit at the end of travel, and helps the dot settle quicker — all without permanent mods.

Power Rates

Soft Springs 1.1mm

Slide on the battery:

• Short: 8.8lbs
• Long:  9.5lbs 

Slide full open position (approx.):

• Short: 16.5lbs
• Long:  17.5lbs

Standard Springs 1.15 mm 

Slide on the battery: 

• Short: 8.8lbs
• Long: 9.5lbs 

Slide full open position (approx.):

• Short: 18.7lbs
• Long:  19.8lbs

Why shooters choose this system

• Built for the 5" LS Edge: Sized for the long-slide geometry to keep timing consistent.

• Multi-spring guide rod: Primary spring plus internal buffering to slow the slide before frame impact.

• External spring set included: Multiple power rates so you can tune for ammo, comps, or match day.

• Drop-in install: No milling, no fitting; reverses in minutes.

• Smoother impulse: Less nose dip and muzzle flip, cleaner sight return, faster follow-ups.

• Protects the gun: Reduced battering on lugs and frame for longer service life.

What’s in the box

• Precision guide rod (multi-spring internal assembly)

• External recoil springs in graduated strengths (clearly labeled)

• Spacer/retainer (model-specific)

• Quick start card with tuning tips

How it works (plain English)

Think of the stock spring like one big shock absorber. This system stacks springs with different rates. The first part of the slide stroke is controlled by the main spring; as it nears the end of travel, the secondary springs add resistance and cushion the impact. On the way forward, the calibrated rate helps strip the next round without overdriving the nose.

Tuning guide (start here)

• Standard pressure 9mm: Start with the “medium” external spring; verify lock-back on empty.

• Soft ammo / comped setups: Try the lighter spring for reliable cycling and less dip.

• Hot loads / +P: Move one step heavier to slow the slide and protect the frame.

• Suppressor use: Test medium first; adjust for ejection pattern and lock-back.

Tip: change one variable at a time, shoot 3–5 mags, then check ejection, brass distance, and lock-back.

Install notes

1. Verify clear. Field strip.

2. Drop the internal assembly onto the guide rod seat.

3. Choose an external spring and install with the open end toward the muzzle (if marked).

4. Reassemble, hand-cycle to confirm smooth travel.

5. Range test, then adjust spring rate if needed.

FAQ

Does this fit the 5" FN 509 LS Edge specifically?
Yes, it’s sized for the long-slide (5") LS Edge. Using the correct length ensures proper timing and return to battery.

Will it reduce recoil or just change the feel?
Both. The multi-stage resistance softens peak impact and smooths the impulse, which helps sights track flatter and settle faster.

How do I know which spring weight to run?
Start with the included “medium” spring for factory 115–124gr loads. If brass throws excessively far or the dot dips hard, step heavier; if it fails to lock back or feels sluggish, step lighter.

Is reliability affected?
Not when tuned correctly. Always function-test with your carry or match ammo and verify lock-back on empty.

Do I need tools or a gunsmith?
No special tools. It’s a drop-in system you can install during a regular field strip.

Will this work with comps or suppressors?
Yes. That’s where the spring options shine—tune for added mass/backpressure to keep the slide speed in the sweet spot.

How often should I replace springs?
Inspect at routine cleaning intervals. Replace external springs if you notice short-stroking, erratic ejection, or after a high round-count season to maintain consistent timing.

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