Gemtech GM-45 and Lunar-45 Threaded Rear Mount – 1/2x28 Adapter
Not Yet Rated | Write the First Review SKU: 222-GEM-12196
UPC: 609224000000
MFG#: 12196

Gemtech 5.56 ETM 3-Port Muzzle Brake – 1/2x28 Thread

Take control of recoil and flash. The Gemtech 5.56 ETM 3-Port Muzzle Brake delivers superior recoil reduction, flatter shooting, and suppressor-ready compatibility for AR-15s and other rifles chambered in 5.56/.223. Precision-machined and built for durability, it’s designed to keep your rifle shooting smooth and accurate while pairing seamlessly with Gemtech’s ETM suppressors.

Product Overview

A well-engineered muzzle brake can completely change how your rifle handles. The Gemtech 5.56 ETM 3-Port Muzzle Brake is threaded 1/2x28 to fit most AR-15 and 5.56 NATO platforms. Its three-port design helps cut recoil and muzzle rise, allowing faster follow-up shots and better target retention.

Unlike basic brakes, this model is optimized for use with the Gemtech ETM (Extreme Taper Mount) system, ensuring repeatable suppressor alignment and reducing the risk of carbon lock. At just 2 ounces with a black nitride finish, it’s lightweight, rugged, and purpose-built for serious shooters.

Key Features

• Thread Pitch: 1/2x28 TPI (standard for 5.56/.223 rifles)

• Caliber Compatibility: 5.56 NATO / .223 Remington

• Design: 3-port brake for recoil and muzzle rise reduction

• Suppressor Ready: Works with Gemtech ETM suppressor mounts

• Material: Precision-machined steel for maximum durability

• Finish: Black nitride for corrosion resistance and longevity

• Weight & Length: Approx. 2 oz, 2.37 inches overall length

• Compliance Ready: Pre-dimpled for pin & weld to make 14.5” barrels non-NFA

Why Choose the Gemtech ETM Muzzle Brake?

The ETM 3-Port Muzzle Brake is more than just recoil control. It’s engineered to:

• Provide repeatable suppressor alignment with ETM mounts

• Prevent carbon locking when shooting suppressed

• Maintain accuracy with consistent point of impact

• Add compliance options for 14.5” AR-15 builds

• Deliver rugged performance without excess weight

Whether you’re upgrading your AR-15 for competition, tactical use, or suppressor integration, this muzzle brake ensures your rifle performs at its best.

Specifications

Installation Tips

• Ensure barrel is threaded 1/2x28 TPI

• Use a crush washer or shims to properly time the brake

• Torque to spec and confirm alignment before firing

• For suppressor use, always check concentricity

FAQs

Q: What rifles will this muzzle brake fit?
It fits most rifles chambered in 5.56 NATO / .223 Remington threaded in 1/2x28 TPI, including AR-15 platforms.

Q: Does this brake reduce recoil?
Yes. The 3-port design significantly reduces felt recoil and muzzle rise for faster follow-up shots.

Q: Is it compatible with Gemtech suppressors?
Yes. It is part of the ETM (Extreme Taper Mount) system, ensuring reliable suppressor attachment and repeatable alignment.

Q: Can I use this to make a 14.5” barrel non-NFA length?
Yes. The brake is pre-dimpled for pin & weld installation, making it suitable for 14.5” barrels that need to meet 16” overall length requirements.

Q: How much does it weigh?
It weighs approximately 2 ounces, keeping your rifle balanced and lightweight.

Q: What finish does it use?
The muzzle brake has a black nitride finish for strength and corrosion resistance.

Upgrade Your 5.56 Rifle Today

The Gemtech 5.56 ETM 3-Port Muzzle Brake – 1/2x28 is the ultimate blend of recoil control, suppressor readiness, and rugged durability. Whether you’re building a compliant AR-15, running suppressed, or just looking to tighten your groups with faster follow-up shots, this muzzle brake gives your rifle the performance edge it deserves.