First Responder/MIL/Veteran Discount

PMM Duty Compensator for FN 509


Would You Like An Extra Shim Kit?

Yes (No Loctite 272)

PMM JTTC "Muschi" Mounting Block

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Product Details


1 x FN 509 Compensator

  • 7075 Aluminum finished in a type 3 class 2 hardcoat anodize.
  • No set screws, mounts like a muzzle device on a rifle.
  • Captured design ensures that even if your comp comes loose it will not come off or impede function.
  • Designed around the FN factory threaded barrels (1/2 x 28) but will work with others that have the same threads. (Gap may vary)
  • Technology born and improved upon from our PMM X-Comp pistol.

1 x Shim Kit:

  • 4 x 0.010″ Shim
  • 2 x 0.005″ Shim
  • 1 x 0.002″ Shim
  • 1 x 0.05mL Vial Loctite 272

Optional “Muschi” Mounting Block



  • 509 Midsize Tactical
  • 509 Compact Tactical
  • 509 Tactical
  • 509 Midsize
  • 509 Midsize MRD
  • 509 Compact
  • 509 Compact MRD
  • 509

NOT Compatible with:

  • 509 Edge Series
  • 509 Compact MRD w/ Compensator
  • 509 Fullsize MRD
  • Non-509 Series Pistols


The PMM Compensator uses a proprietary mounting system much like what is found on all modern rifles utilizing a combination of shims and proper timing of the compensator in relation to the Pistol slide.

Additionally, the PMM compensators utilize a single port design at the 12 O’clock position which maximizes the effectiveness of the compensator in keeping the muzzle of the pistol down and allows the slide to “track” faster and more accurately for follow up shots.

During testing the PMM compensators were designed to work with most factory loaded ammunition but will yield the best results with a +P or Nato spec cartridge. We have adapted our designs to integrate with and complement the design of your pistol so no longer does a compensator have to look like an afterthought slapped on the end of your pistol, Rather it Delivers unmatched performance and looks.


Recoil Reduction:

The 509 duty comp was designed to work with most factory loaded ammunition and yields and average 30-35% reduction in muzzle climb with 115gr UMC


Ammo Recommendations:


Federal American Eagle

Speer Lawman


Remington UMC

Sig Sauer





Speer Lawman

Federal American Eagle

Sig Sauer



Remington UMC


Most ammo will run, but you will see less performance due to a lack of velocity


Ammo to stay away from:

Blazer 115

Winchester White Box 115

Armscor 115

PMC 115

All reloads or reman ammo








Additional information

Weight N/A


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