True Precision SIG P320 Compact / X-Carry / M18 3.9" Threaded Barrel — Black Nitride Treated
Not Yet Rated | Write the First Review SKU: 222-TRU-TP-P32CB-XTBL
UPC: 719000000000
MFG#: TP-P32CB-XTBL

SIG P320 Compact / X-Carry / M18 3.9" Threaded Barrel — Black Nitride Treated

If you want a threaded barrel that fits right, runs clean, and looks the part, this is the finish most people pick. This True Precision barrel is made for the SIG P320 Compact platform family (including X-Carry and M18) with a 3.9" length and a 1/2x28 threaded muzzle for common 9mm accessories.

Part number: TP-P32CB-XTBL
Finish option: Black Nitride Treated (Required)

Quick details

• Fits: SIG P320 Compact, X-Carry, and M18 (9mm, 3.9" class)
• Length: 3.9"
• Thread pitch: 1/2x28
• Ready for: suppressors, comps, and thread-mounted devices (where legal)
• Made in: USA

What you’re getting (and why it matters)

True Precision barrels are built around the stuff you actually notice on the range: consistent lockup, reliable feeding, and a bore that’s finished like it should be. The geometry, chamfers, and feed ramp work are designed to function smoothly across a wide range of ammo styles.

Highlights:

• Broach-cut rifling in stainless steel for consistent performance

• Careful edge work and chamber finishing to support reliable cycling

• Drop-in intent for most builds (with real-world tolerance notes below)

Black Nitride Treated finish

This treatment produces a deep black look while improving surface hardness and resistance to wear and corrosion. It’s a smart choice if your barrel sees frequent holster time, sweaty carry conditions, or a lot of rounds between cleanings. Many shooters also like it because it keeps a low-glare appearance that matches most slides and accessories.

Compatibility notes (read before ordering)

Because SIG has multiple slide variations and tolerance stacks exist, a few fitment realities are worth calling out:

• Loaded Chamber Indicator (LCI): Some LCI-equipped pistols may require professional modification or removal of the LCI to use a no-LCI style barrel setup. If you’re not sure what your slide uses, a qualified armorer or gunsmith can confirm quickly.

• X-Carry tolerance variation: In rare cases, minor fitting may be needed due to OEM slide variation.

Safety note: Always confirm legality of threaded barrels and muzzle devices where you live, and have installation checked by a qualified professional if you’re uncertain.

Specifications

• Platform: SIG Sauer P320 Compact / X-Carry / M18

• Caliber: 9mm

• Barrel length: 3.9"

• Thread pitch: 1/2x28 (right-hand)

• Finish: Black Nitride Treated

• Rifling: Broach cut

• Country of origin: USA

Care and maintenance

A light wipe-down after shooting and a normal cleaning routine will keep the bore and exterior looking sharp. For best long-term performance, avoid harsh abrasives on the finished exterior.

FAQ

Is this the correct listing for the “Black Nitride Treated (Required)” option?
Yes. This page is written for the Black Nitride Treated variant, part number TP-P32CB-XTBL.

Will this fit my SIG M18?
It’s designed for the M18 size class, but some M18 slides use an LCI system. If your slide is LCI-equipped, you may need professional work for proper compatibility.

What does 1/2x28 mean?
It’s the thread pitch at the muzzle. Many 9mm suppressors, compensators, and adapters are built around 1/2x28.

Do I need a gunsmith to install it?
Many owners treat it as a straightforward upgrade, but tolerance variations exist. If you notice fitment issues or you have an LCI-equipped slide, a gunsmith is the right move.

What’s the advantage of the nitride-treated finish?
Better resistance to wear and corrosion, plus a deep black appearance that stays looking clean with normal use.

Can I run this with a suppressor or compensator?
If your device matches 1/2x28 and threaded barrels are legal in your area, it’s compatible in the same way other 1/2x28 9mm barrels are.

Does it work with common range ammo?
Yes, it’s built to run a wide range of ammo designs. As with any barrel change, function-test your chosen defensive ammo before relying on it.