First Responder/MIL/Veteran Discount

PMM Ultra Compensator for FN 509


Would You Like An Extra Shim Kit?

Yes (No Loctite 272)

PMM JTTC "Muschi" Mounting Block

Order total:

Earn up to 150 Points.

Product Details


1 x FN 509 Ultra 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


PMM has adopted the technology from our Ultra Barrel and Comp Combo series and applied it for use on the factory threaded barrel utilized on the 509 Tactical series of pistols. While slightly larger in overall length, our 509 Ultra yields a 45-55% reduction in muzzle rise with 115gr ammo

All PMM compensators mount 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.

The PMM ULTRA for the FN 509 Tactical and Compact Tactical utilizes a dual 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.

The PMM ULTRA JTTC was designed to work with most factory loaded ammunition and yields and average 45-55% reduction in muzzle climb with 115gr UMC!(please refer to testing charts at the bottom of the product page)

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.

This compensator is LARGER in size in comparison to our single port so if you may need to modify your holster to accept this compensator.


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


Black, FDE

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