TFB Review: Parker Mountain Machine P365 JTTC Compensator By: Matt E


The world of concealed carry has changed dramatically over the last 10 years. Gone are the days of massive bulky full metal firearms with horrid triggers in an effort to be armed. There are endless choices with infinite possibilities to custom your carry firearm to make it truly one of one. I recently picked up the SIG Sauer P365 Spectre Comp and enjoyed shooting it and as a result, I decided to purchase one of the PMM P365 comps to test out on my original P365 I don’t carry much anymore. Let’s take a closer look at the Parker Mountain Machine P365 JTTC Compensator.

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The PMM barrel and compensator set has been growing in popularity over the last couple of years. I’ve done a few different reviews of Parker Mountain Machine compensators including the P320 JTTC review as well as the P320 Micro Comp review. The P365 is their latest design with a brand new replacement barrel and compensator along with a shim kit to get the desired fitment you need on your handgun. Parker Mountain sells barrel and compensator combinations for both the P365/P365X as well as the P365XL.

Photo Courtesy of Parker Mountain Machine

PMM’s replacement barrels are made from 416R stainless steel with a DLC coating to give it that factory look as well as a 4140 PH Stainless Steel compensator that’s also DLC finished. The PMM barrel and compensator design have no set screws or anything like that making it a fully captured design on the threaded barrel. This means users don’t have to worry about the comp coming loose and shooting off the end of the barrel. At the time of writing this article, PMM has their P365 JTTC Compensator kits available on their website for an MSRP of $360.

Range Time

I’ve had a few range sessions with the Parker Mountain Machine P365 JTTC Compensator and there are a few things to note from the standard P365 and even the Spectre Comp. For this review, I decided to change out the grip mod on my standard P365 to the XL to make it the same size as my other guns for a baseline comparison that will come out a bit later down the road. The barrel and compensator combo is really easy to install with the included Muschi mounting block. This slides right into the vise and makes installation really easy. For my testing, I shot a few different kinds of 9mm ammo to ensure everything worked the way it was supposed to. The majority of the ammo was 115gr Federal, 124gr American Eagle and 115gr LAX factory new ammunition.

Accuracy and Reliability

I have roughly 650 rounds through this compensator and barrel combo in a few range trips. I shot the P365 JTTC Comp a fair bit at indoor and outdoor ranges to see how much flash you would get in low light or enclosed spaces. Out of the 650 rounds through my little compensator, I am happy to report there wasn’t a single malfunction to speak of during my testing. The P365 was shot extensively before I switched out the barrel for the new PMM combo, but it ran like a sewing machine for the duration of testing.

When it came to accuracy, I was honestly very surprised by the results. I would normally shoot between 7-15 yards with iron sights to keep things consistent. During my last range session, I decided to try out the accuracy for time. I wanted to put two fully loaded up 12 round magazines through the gun in the fastest amount of time while being accurate. I shot the drill from 10 yards away and ended up finishing with a time of 11.35 and a solid ragged hole. Recoil reduction from the standard P365 models is roughly 40% depending on ammo. From my testing I can confirm there is a noticeable difference in felt recoil between the JTTC compensated version and standard P365.

Speed Test

Now, I know the XL grip mod is easier to shoot than the original P365 grip, but the combination of this grip with the Parker Mountain Machine P365 JTTC Comp makes a truly easy gun to shoot quickly and accurately. The biggest difference between the comp version and standard version is that lack of snappiness. As soon as I installed the comp, any hint of that small gun snap was completely gone. The compensator isn’t going to magically turn you into a better shooter overnight, but it makes life considerably easier when firing quick follow up shots.

The compensator does an extraordinary job of keeping that muzzle flat to shoot fast while remaining accurate. After a full range session of shooting on the clock, I shot roughly 15-20% faster while being just as accurate which is an improvement that cannot be ignored. One small thing to note is the lack of flame I had come out of the JTTC Comp compared to the Spectre Comp from SIG. I will dive into this more on the comparison article but shooting the PMM compensator with the same ammo as the SIG Spectre Comp and there was less muzzle flash from the JTTC comp. This observation may not mean anything and isn’t exactly scientific but I figured I would add it in for sure.

Carrying With The JTTC Comp

Over the last few weeks, I decided to carry my P365 with the PMM JTTC comp on it just to see if theres a huge felt difference compared to the standard P365 XL. Luckily the PMM JTTC comp will fit inside the same holsters for both the P365 and P365XL so finding a holster is relatively easy. Drawing from the holster with a compensator installed is basically the same as a regular full size variant.

After carrying this gun around for a few weeks, I can tell you its basically the same as carrying any regular P365 XL with absolutely no difference in feel or weight so its basically really easy to haul around all day inside an IWB holster. If you have concerns about carrying it with the compensator on it, I would rest easy because there’s virtually no difference from other models of the same length.

Overall Thoughts

When it comes to putting accessories and aftermarket parts on small carry guns, I’m typically one that is completely against it. I never saw the point and I will be honest and say the Parker Mountain Machine P365 JTTC Compensator definitely proved me wrong. I have been converted into a true believer with this compensator and for some it may seem like a silly upgrade, but It definitely has its benefits with recoil mitigation as well as stability.

What do you guys think of little compensators like this on carry guns? Is it a bad idea or is it a benefit if they serve a purpose? Let me know down in the comments below either way because I’m genuinely interested. If you have questions about carry guns or firearms in general, feel free to shoot me a message on Instagram @fridgeoperator. Stay safe out there!