9 Inch Glock 21 (Gen 3, SF, 4) Threaded Barrel

$179.99

WHAT’s INCLUDED:

9” Barrel with/without 1/2″ x 28 thread
Thread Protector (included)

Available on backorder

SKU: MTB-21-9 Category: 9" Barrels

Description

9″ Competition Length Threaded Barrel for Glock 21 (Gen 3, SF, Gen 4)

Elevate your .45 ACP to carbine-class performance.

Redefine what your large-frame handgun can do. This 9-inch extended barrel is purpose-built for the Glock 21 (Gen 3, SF, and Gen 4), converting a standard service pistol into a highly stable, precision platform. By nearly doubling the rifled length compared to the factory setup, this barrel maximizes propellant burn for heavier rounds and provides the necessary length for chassis conversion kits.

Engineered for longevity, the barrel is CNC-machined from ordnance-grade steel. It is finalized with a specialized Black Nitride treatment, a process that hardens the surface and significantly reduces friction, offering superior protection against corrosion and fouling even after thousands of rounds.

Key Technical Specifications

Suppression-Ready Threading: Cut with industry-standard .578×28 TPI threading, ensuring seamless compatibility with the vast majority of .45 ACP suppressors and recoil-mitigating muzzle devices.
Polished Feed Geometry: The feed ramps are precision-profiled and polished to a mirror finish, guaranteeing reliable feeding for wide-mouth hollow points and standard ball ammunition alike.
Tight Tolerance Fitment: Designed as a drop-in match upgrade, this barrel features tighter lockup tolerances than OEM parts, which aids in consistency and accuracy downrange.
Custom Aesthetic: The extended barrel length acts as a visual centerpiece, giving your build a distinct, long-slide “operator” profile.

Primary Use Cases

This long-configuration barrel is the ideal foundation for:

Pistol-Caliber Carbine (PCC) Conversions: The 9″ length allows you to fully utilize stabilizing chassis systems (like the MCK, Flux, or Recover Tactical) to create a potent .45 carbine.
Suppressed Operations: .45 ACP is naturally subsonic; combined with this barrel’s length and threading, it makes for an incredibly quiet and effective suppressed host.
Custom PF45 Projects: The ultimate upgrade for builders completing a large-frame Polymer80 PF45 frame in .45 Auto.

Compatibility Warning: This barrel is strictly engineered for the Glock 21 (Gen 3, SF, and Gen 4). It is NOT compatible with the Glock 20 (10mm), Glock 30 (Compact .45), or standard frame Glock 17/19 models.

Additional information

Weight	1 lbs
Dimensions	1.5 × 10 × 1 in

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