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PMM 509 Competition Combo: Ultra JTTC & Duty Magwell Combo w/ Muschi



Would You Like An Extra Shim Kit?

Yes (No Loctite 272)
Yes (With Loctite 272)
Product price: $262.00
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​Due to ITAR restrictions, this item cannot be shipped outside of the U.S. International orders will be cancelled per our policy, less a 6% transaction fee.

Product Details

Maximize performance out of your FN 509 Tactical Full Size with our updated Competition Combo!




1x PMM 509 Ultra Compensator for Factory Threaded Barrels


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


*If ordering a 13.5×1 LH Metric compensator, your shim kit will include a PMM Metric Shim Alignment Rod. These are only necessary for metric barrels.*


  • 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 (1/2×28) but will work with others that have the same threads. (Gap may vary)
  • Technology born and improved upon from our PMM X-Comp pistol.


1x PMM 509 Duty Magwell


  • 8625 type 3, class 2 hardcoat anodize
  • CNC’d in-house out of 6061 aluminum
  • works with both factory FN standard and extended magazines



1x PMM 509 Muschi Mounting Block


9mm Ammo known to work well with our dual port comps.



Federal American Eagle

Speer Lawman


Remington UMC

Sig Sauer





Speer Lawman

Federal American Eagle

Sig Sauer



Remington UMC


Most 147gr ammo will run but you will see less performance due to a lack of velocity



Additional information

Weight N/A


4 reviews for PMM 509 Competition Combo: Ultra JTTC & Duty Magwell Combo w/ Muschi

  1. Josh D.

    Love the compositor, easy install

  2. Mark C.

    Awesome comp! It really kept smoothed out the recoil impulse on my 509T and the duty magwell functions well and is still easy to conceal.

  3. Jake C.

    Got the 509 JTTC comp and magwell for my 509 Tactical. The fit and finish is amazing, the comp install was simple and easy, the magwell…..was easy when I realized what was going on with it. Totally my fault (we won’t talk about that). Took it to the range the next day for a side by side comparison with a friends factory 509 Tactical…..WOW, it’s was a night and day difference between the two guns. He was throughly impressed as well and said if he wasn’t going suppressed with that gun he’d do the same thing. Added an Apex trigger and striker the following week and have been running the gun a bit. I’m between 200 and 300 rounds through this setup and still enjoy it every shot. Will be back for another comp on another platform for sure!

  4. Garrett S.

    Very happy with this purchase. One of the best fitting products I have purchased and super easy to install. I will use this company many more times in the future!!!

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