What thread pitch and calibre are required to install the GrovTec G-Comp GTHM351?

This compensator is built strictly for 9mm calibre firearms featuring a standard 1/2-28 TPI muzzle thread. It must not be used on larger calibres such as .40 S&W or .45 ACP, nor should it be mounted on alternative metric threads without the correct adapters.

Does the GrovTec G-Comp 9mm compensator also reduce muzzle flash in low-light environments?

The GTHM351 is precision-ported specifically to redirect gases upward and outward to mitigate vertical muzzle climb and felt recoil for faster follow-up shots. If low-light flash reduction is your primary requirement, the manufacturer recommends using a dedicated flash hider instead.

Are muzzle compensators such as the GrovTec G-Comp legal to use on firearms in Australia?

Yes, standard muzzle compensators and brakes are generally legal across Australian states and territories, unlike restricted sound suppressors. They can be fitted to compatible Category A, B, and H firearms with factory 1/2-28 threading, provided you comply with local registry and modification laws.

What hardware is included for installation and how durable is the finish?

The GTHM351 includes a steel crush washer to assist with proper alignment and timing during installation onto your barrel. Finished in a rugged black nitride, the precision-machined steel provides exceptional wear, heat, and corrosion resistance for demanding shooting conditions.

9mm Muzzle Brake - GrovTec GTHM351

The GrovTec G-Comp 9mm Muzzle Compensator ½-28 (MPN: GTHM351) is a precision-machined steel firearm accessory engineered to mitigate muzzle rise and felt recoil. Designed for platforms chambered in 9mm (9x19mm Parabellum / 9mm Luger), this compensator redirects expanding propellant gases upward and outward through dedicated top and side ports. This gas redirection keeps the firearm flat during rapid strings of fire, preserving sight alignment and speeding up target reacquisition. Treated with a black nitride finish, it provides robust resistance to heat, fouling, and environmental corrosion, and comes complete with a steel crush washer for exact timing and alignment during installation.

Key Features

Gas Redirection System: Features precision-machined top and side ports that channel expanding combustion gases to counteract vertical muzzle climb and soften felt recoil.
Black Nitride Surface Finish: Delivers durable resistance against high operating temperatures, gas erosion, and corrosion.
Included Timing Hardware: Ships with a dedicated steel crush washer to ensure correct indexing and secure alignment on the barrel shoulder.
Passive Mechanical Design: Operates purely on propellant gas dynamics with no moving parts or maintenance-intensive components.

Specifications

Brand: GrovTec US Inc.
Manufacturer Part Number (MPN): GTHM351
Calibre Compatibility: 9mm (9x19mm Parabellum / 9mm Luger)
Thread Pitch: 1/2"-28 TPI
Material: Precision-machined steel
Finish: Black nitride
Included Accessories: Steel crush washer

Who is the GrovTec G-Comp 9mm Muzzle Compensator for?

9mm Pistol Calibre Carbine (PCC) competitive shooters — reduces vertical muzzle rise on carbines with standard 1/2"-28 TPI threading, allowing dynamic 9mm competitors to maintain flat sight tracking and accelerate split times between shots.
Tactical sporting rifle shooters on 9mm platforms — provides active recoil redirection and muzzle stability for 9mm calibre rifles, keeping optics on target during rapid-fire drills.
Threaded 9mm handgun shooters — threads directly onto 1/2"-28 TPI handgun barrels to tame muzzle displacement and improve follow-up shot cadence without altering firearm action reliability.

Less suitable for: Firearm platforms chambered in calibres exceeding 9mm (such as .40 S&W or .45 ACP), barrels utilizing alternative metric pitch threads (such as 13.5x1 LH) without dedicated adapters, or operations prioritising low-light flash reduction over recoil mitigation, which require a dedicated 9mm flash hider.

SKU	GT40839LP
Model #	GTHM351
Brand	Grovetec
Shipping Weight	1.0000kg

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Grovtec Gthm351 9mm Muzzle Compensator 1/2-28 Black Nitride

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