The True Precision 9mm Fuse Barrel for Sig P365 with Black Nitride finish (Part # TP-P365FB-XTBL / TPP365FBXBL, UPC 719104542001) is a premium, threaded, drop-in upgrade built specifically for the Sig Sauer P365-FUSE 4.3" 9mm models. Designed to deliver better-than-OEM accuracy, reliability, and style, this barrel is machined from USA-sourced 416R stainless steel and finished in a stealthy black nitride coating for serious everyday carry and performance use. OpticsPlanet+1
If you’re building a comp-ready P365 Fuse, preparing for future suppressor use (where legal), or just want a higher-performing barrel with a clean black look, the True Precision Black Nitride P365-FUSE threaded barrel is a standout choice.
Built for the Sig Sauer P365-FUSE 4.3" Platform
This barrel is purpose-built around the longer P365-FUSE configuration:
Designed for: 4.3" Sig Sauer P365-FUSE 9mm models OpticsPlanet+2Midwest Gun Works+2
Drop-in ready – no gunsmithing required for most factory-spec slides
Also supported within the Fuse ecosystem for P365 3.1" and P365XL 3.7" builds using Fuse slides, per True Precision’s FUSE barrel line. Midwest Gun Works+1
That means you can upgrade from factory to match-grade performance in just a few minutes with standard field-stripping.
USA-Sourced 416R Stainless Steel Core
At the heart of this barrel is certified 416R stainless steel, the same material used in many high-end match rifle and pistol barrels: OpticsPlanet+2PHLX Tactical+2
USA-sourced, certified 416R stainless steel for precise machining and tight tolerances
Excellent corrosion resistance, ideal for concealed carry pistols exposed to sweat and humidity
Provides a strong accuracy foundation with consistent dimensions and smooth internal finish
If your P365-FUSE is a serious EDC or training gun, the material choice matters—and this barrel is built for real-world use, not just looks.
Black Nitride Finish – Stealthy, Durable, and Easy to Clean
The exterior is treated with a robust black nitride (salt bath nitride / QPQ-style) finish: OpticsPlanet+2Primary Arms+2
Deep black, low-glare appearance that pairs perfectly with factory or custom black slides
Improved surface hardness and wear resistance, helping the barrel stand up to thousands of cycles
Naturally slick surface that can make cleaning easier and contribute to smooth cycling
It’s the perfect finish for shooters who want a subtle, tactical look instead of flashier coatings, while still getting top-tier durability.
Threaded 1/2x28 – Comp & Suppressor Ready
This Fuse barrel features a threaded muzzle with the industry-standard 1/2x28 thread pitch, specifically for 9mm: OpticsPlanet+2Midwest Gun Works+2
Ready for 9mm compensators, muzzle devices, and direct-thread suppressor mounts (where legal)
Comes as part of a 4.95" overall threaded barrel length, extending beyond the slide enough for devices while remaining compact for carry Midwest Gun Works+1
Often includes a thread protector from retailers, so you can run it “plain” while keeping the threads safe
Whether you’re chasing a flatter-shooting compensated carry gun or planning a future suppressor host, this barrel sets up your P365-FUSE for next-level capability. Always check local/state laws before installing or using threaded barrels or suppressors.
Extended 4.95" Threaded Length for the 4.3" Fuse Slide
Although it’s described as a 4.3" Fit, the actual threaded length is approximately 4.95", designed to work perfectly with the P365-FUSE 4.3" slide: Midwest Gun Works+2Bauer Precision+2
Gives enough extension for threads and a protector/comp without making the pistol unwieldy
Creates that classic “match barrel protruding from the slide” look popular on high-end custom builds
Still compact enough to carry comfortably in many threaded-barrel–compatible holsters
It’s a great balance between performance, aesthetics, and concealability.
Proprietary Broach-Cut Rifling – 6-Groove, 1:10 Twist
True Precision uses a proprietary broach-cut rifling process for their P365-FUSE barrels: OpticsPlanet+2PHLX Tactical+2
6-groove rifling, 9mm 1:10" right-hand twist – ideal for a wide range of common 9mm bullet weights, from light practice loads to heavy defensive rounds PHLX Tactical
Rifling is suitable for all ammo types, including cast lead, unlike some polygonal designs True Precision+1
Cut for SAAMI 9x19 Luger specs to support safe, reliable operation with standard-pressure and +P (where appropriate) ammunition True Precision+1
The result is a barrel that doesn’t just look good—it helps you shoot tighter, more consistent groups with the ammo you actually use.
Advanced Feed Ramp & Geometry – Built to Outperform OEM
True Precision specifically designs their barrels to outperform OEM feeding and reliability standards: OpticsPlanet+2Midwest Gun Works+2
Features advanced cuts, chamfers, and an improved feed ramp to aid in smooth, reliable feeding
Engineered to handle varied bullet profiles, including modern jacketed hollow points and defensive loads
Helps reduce the chance of hang-ups or nose-dives, especially when the pistol gets dirty during high round-count sessions
If you rely on your P365-FUSE for defense or duty, this reliability-focused engineering is just as important as accuracy.
No LCI Cut – Clean Slide Window & Note for LCI Models
Like other FUSE threaded barrels, this model does NOT retain the LCI (Loaded Chamber Indicator) cut-out: PHLX Tactical+1
Gives the barrel hood area a clean, uniform look through the slide window
On certain pistol versions with a factory LCI system, True Precision notes that the LCI may need to be removed or shortened for proper fit/function. True Precision+1
If your specific P365 variant uses an LCI, consult a qualified gunsmith to ensure safe and proper setup.
Perfect for EDC, Range Work, and Performance Builds
This Black Nitride P365-FUSE threaded barrel is an excellent upgrade for:
Everyday carry pistols – corrosion-resistant, match-grade barrel in a discreet black finish
Performance and competition-style builds – pair with a comp and optic for a fast, flat-shooting micro gun
High-round-count training guns – 416R stainless + broach-cut rifling stand up well to frequent use
Whether your P365-FUSE is a low-profile carry piece or a showcase custom build, this barrel can handle both worlds.
Key Specs – True Precision P365 Fuse Black Nitride Threaded Barrel
From current manufacturer and dealer listings: OpticsPlanet+2Midwest Gun Works+2
Manufacturer: True Precision, Inc.
Model: Fuse 9mm P365-FUSE Threaded Barrel
Part Numbers: TP-P365FB-XTBL / TPP365FBXBL
UPC: 719104542001
Caliber: 9mm Luger (9x19)
Fitment: Sig Sauer P365-FUSE 4.3" 9mm models (also supported for P365 3.1" & P365XL 3.7" with Fuse slide setups)
Material: USA-sourced 416R stainless steel
Finish: Black Nitride
Overall Barrel Length: ~4.95" (threaded)
Twist Rate: 1:10" RH
Rifling: Proprietary broach-cut, 6-groove; suitable for all ammo including cast lead
Chamber: SAAMI 9x19 Luger
Muzzle Threads: 1/2x28
Type: Threaded pistol barrel, does not retain LCI cut
Why Choose the True Precision Black Nitride P365-FUSE Threaded Barrel?
You should choose this barrel if you:
Own a Sig Sauer P365-FUSE and want a top-tier threaded barrel for comps or suppressors
Prefer a sleek black nitride finish that is both discreet and extremely durable
Want match-grade 416R stainless construction with improved accuracy and feed reliability over OEM barrels
Want a drop-in upgrade that’s easy to install but offers noticeable performance gains
For concealed carriers, defensive shooters, and custom-build enthusiasts, the True Precision Barrel, 9MM, Fits P365 Fuse, Nitride Finish, Black, Threaded, 1/2x28 (TP-P365FB-XTBL / TPP365FBXBL / 719104542001) is a superb upgrade that brings American-made precision, rugged durability, and comp-ready capability to one of the most popular micro-compact platforms on the market.
The End
