Sig P365XL Threaded Barrel

Regular price$189.99
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We have used many True Precision barrels on our R&D handguns over the years and have seen nothing short of quality. We have added these to our collection of top tier products we recommend to customers searching for the best products in the industry. This barrel is for the P365XL 3.7" slide. This barrel has 1/2-28 threads. The LCI has been removed from ALL True Precision threaded barrels.

  • New for 2023, all P365 models from True Precision will no longer have the LCI peep hole cut on top. This will assist in keeping pistol mounted optics clean and free from powder blowback and debris escaping from a LCI hole. 
  • Easy to install drop-in design fits the P365 XL 3.7" and P365XL Spectre 3.7". NOT for the Spectre Comp which uses a 3.1" barrel. See our other P365 listings for the 3.1" model. Will not fit the P365X MACRO Ported slide version that uses a 3.1" barrel. It WILL fit the P365X Macro with the non-ported slide and 3.7" barrel.
  • Threaded barrel length is 4.35" overall. (without thread protector attached).
  • Advanced proprietary broach cut design specifically engineered for increased accuracy potential.
  • Broach cut 6 groove rifling allows for all ammo types to be used safely, including cast lead.
  • 100% Designed and manufactured in the USA with USA sourced certified 416R stainless steel.
  • 9mm 1/10RH twist rifling.
  • Special deep style target crown for non-threaded versions or 1/2x28 threads with included thread protector on threaded versions.
  • Threaded versions include Viton high heat integral O-ring lock thread protector.
  • SAAMI spec chamber. 
  • Weight: 2.7oz without thread protector installed. 
  • Improved overall fit from OEM with added chamfers, improved radius cuts, and other additions for a better than OEM barrel.
  • Assorted specialty coatings and finishes to choose from.
  • Improved feedramp design over OEM for more reliable feeding of defensive ammo. 
  • Lifetime performance warranty on function


Every compensator we manufacture has undergone rigorous reliability testing!

The design phase

Every product we make goes through a week long design process and multiple versions before we machine a prototype!

CNC Machining

We currently machine all of our compensators on 2 brand new Doosan DNM4500S CNC milling machines and a 2019 Tormach 1000mx CNC milling machine!


The answer is easy! All you need to do is purchase the threaded barrel that matches your slide. For example, if you have a carry length slide you need a carry length threaded barrel (4.6"). If you have an X compact slide you need a X compact threaded barrel (4.3"). This will allow you to run a longer frame and give you an integrated look.


Yes they do. We have run tens of thousand of rounds through all of our models and have had zero malfunctions. If you are having an issue with a build, it is likely the case you have installed our prodcut incoretly or your handgun needs broken in. Compensators need a smooth running system to be reliable. A new handgun has tolerances that need to be worn in before we suggest adding a compensator

-It's easy! We designed our comps to be self-timing so all you have to do is

- Remove your slide from you frame

- Remove your guide rod assembly

- Apply Loctite to barrel threads

- Thread comp onto barrel until it stops

- Back off a 1/8 turn

- Apply Loctite to set screws

- Tighten down set screws


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Filter Reviews:
Todd T.
United States

Great barrel

Good quality, drop in fit. Recommended

Paul A.
United States United States

Absolutely solid barrel

So first I have a 365 and I wanted the XL barrel length. It work’s beautiful and of course I have the Herrington arms comp that makes everything sit flush with no gaps. So far I’ve put a little over 500rds through this barrel and I’m absolutely impressed. At 15 yards I was able to literally put rd ontop of round making one hole in the tgt minus my first round which was .5 inches off. The only downside is after 500rds there is some color already scratched off the front of the barrel I picked the gold but it’s just the barrel and not near the ejection port. It’s expected if you actually train, I’ll come back after my 2k rd mark and update again. Overall insane for a 3.7 barrel

Nicolas C.
United States United States

Well worth the money

Absolutely loving this threaded barrel. Would suggest to anyone

Ciro D.
United States United States

Functions flawlessly

Lots of guys complaining about mals with certain ammo from comp and barrel but I have had zero mals with over 400 rds of all kinds of range ammo with stock guide rod. I upgraded the guide rod just cause and it still functions beautifully.. all in all it’s a magnificent set up with a huge reduction in muzzle rise and recoil . I highly recommend!


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