Additional information
| Length (Factory Unthreaded Barrel Length) | 3.5" barrel, 4" barrel, 4.5" barrel, 5" barrel |
|---|---|
| Compensator | Ultra, Ultra Flat-Face, Micro |
$360.00 Original price was: $360.00.$300.00Current price is: $300.00.
1x PMM Compensator for Walther PDP (polymer)
OR
1x PMM Threaded Barrel
1 x Shim Kit
Optional Muschi Mounting Block
Note: Threaded pistol barrels are not legal in all areas. It is your responsibility to check your local laws before ordering a threaded barrel. You also understand and agree that all firearms and firearms related activities are potentially dangerous if handled/conducted improperly and can pose risks and hazards to yourself and others, which may result in property damage, serious injury or death.
NOT COMPATIBLE with:
Our ultra comp for the PDP was designed around the factory spring, but you may want to change it out. We recommend not going any lighter than 15 lbs.
We personally like and recommend the ZR Tactical Solutions PDP Captured Guide Rod. It is also compatible with the ZR Tactical Solutions PDP Ultra Mass Guide Rod.
Q: What size do I choose?
A: We do not include the thread length in our length options– 4″ is compatible with a slide with a 4″ unthreaded barrel, or 4.6 factory threaded barrel. 4.5″ is compatible with a slide with a 4.5″ unthreaded barrel, or a 5.1″ factory threaded barrel.
Q: Can I buy just the micro or ultra comp?
A: Short answer, no. The barrel and comp are proprietary to one another. Due to the thread depth in the comp and the length of thread on the barrel, our barrel and comp can only be used together.
Please order based off of slide length/ unthreaded barrel length.
3.5″ is compatible with the PDP F 3.5″.
4″ is compatible with a slide with a 4″ unthreaded barrel, or 4.6 factory threaded barrel.
4.5″ is compatible with a slide with a 4.5″ unthreaded barrel, or a 5.1″ factory threaded barrel.
5″ is compatible with a slide with a 5″ unthreaded barrel.
To achieve a flush fit look you will need a 4″ PDP slide and a 5″ full length frame paired with our 4″ ultra flat-faced barrel and comp.
A 4.5″ PDP slide and a 5″ full length frame with our 4.5″ micro barrel and comp will hang past the frame by approximately .100″.
Please note, a 3.5″ slide will only function on a 3.5″ frame, so not there are no flush fit options.

For flush fit, skip to minute six of the video below.
115gr:
Federal American Eagle
Speer Lawman
Wolf
Remington UMC
Sig Sauer
Fiocchi
Magtech
124gr:
Blazer
Speer Lawman
Federal American Eagle
Sig Sauer
Winchester
PMC
Remington UMC
147gr:
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
PMM reserves the right to make esthetical design changes. While we try to accurately represent our current product offerings’ designs, there may be some esthetical variation from the product posted on this page and the product you receive.
| Length (Factory Unthreaded Barrel Length) | 3.5" barrel, 4" barrel, 4.5" barrel, 5" barrel |
|---|---|
| Compensator | Ultra, Ultra Flat-Face, Micro |





James (verified owner) –
The ultra comp on my PDP is one of the softest shooting guns I’ve ran. And the return to zero is immediate, so follow up shots are stupid fast.
Outside of performance Parker mountain deserves credit, this barrel is flawless in the machining and fit. Definitely a match grade barrel
Gaetano Naimo (verified owner) –
I ran the single port comp on my PDP as soon as it came out. I was impatiently waiting for the Ultra to be released. I WAS NOT disappointed. The PDX is my favorite pistol and I love it. PMM makes an incredible product and I’m happy to support a small business!
DANIEL Potempa (verified owner) –
I’ve wanted the Ultra Comp for all of my PDP’s ever since I put the single port on my first PDP. The single port was smooth. Since I already had the Ultra Comp for my Sig P320, I always thought the Ultra Comp would put the PDP over the top…and my guess was right! I love the flat face, with a 4″ slide, sitting on top of my 5″ frame. It it sooooo smooth and when reacquiring the target, my sight barely leaves the window (when shooting with red dots). This design just flat out works! I even bought the Glock Ultra Comp version (instead of the radian), because it just works better…and a better value!
Josh McOmber –
Parker Mountain Machine (PMM) Review – PDP Double Comp Barrel Combo
I run the PMM double comp barrel combo on my Walther PDP Pro X FS, and it’s hands down my favorite handgun setup. PMM’s craftsmanship and performance are unmatched, making their products a staple in our arsenal at Mantis Strategic Defense. We run their barrels and compensator combos on both our Glock and Walther platforms, and I’ve recently added their +4 mag base pads to the mix for both platforms as well. Everything they produce is top-tier.
What really sets PMM apart, though, is their communication and customer service. They go beyond being just a company—they make you feel like a valued friend. Whether it’s answering questions, helping you try out gear, or just hanging out at events like Ohio Range Day, PMM is always approachable, knowledgeable, and willing to help.
Our company has a lot of respect for PMM, and we actively recommend their products to our clients. You’ll always find something from PMM with us on the range, and we’re excited to see this smaller company continue to grow and dominate the industry. They’ve earned our trust and loyalty. Highly recommend! 🤙🏼
mr.lee.young74 (verified owner) –
I purchased the 4” Ultra Barrel and Comp Combo for my poly PDP. Got a chance to run it during a class and loved it. I will definitely pickup another combo for a backup setup.