The Otter Creek Labs OTB Muzzle Brake is a one-piece adapter designed to mount suppressor-ready AR pattern rifles without custom barrel work or gunsmithing. Built from H900 heat-treated 17-4 stainless steel, this muzzle brake combines a functional brake with a precision mount that accepts OPS 12th model OCM5 and AEM5 suppressors on any barrel with 1/2×28 threads, .75" or smaller outside diameter, and a minimum of 2.05" of exposed barrel measured from the shoulder. Whether you're building a precision rifle, hunting rifle, or tactical AR, this adapter eliminates the need for custom collars or barrel modification—just mount, shim for timing, and shoot.

The OTB Muzzle Brake comes finished in either black nitride coating or raw heat-treated steel, so you can match your build aesthetic. The included shim kit is the approved method for timing the suppressor mount to your barrel, and proper use of shims is essential to warranty coverage. This is a serious, no-compromise piece of equipment built for shooters who demand reliability and precision fit.

One critical point: do not use a crush washer with this muzzle device. The shim kit method of timing is the only approved installation approach. This requirement protects both the integrity of the mount and your warranty coverage.

Key Features

• One-piece integrated muzzle brake and suppressor mount—no custom barrel work required
• H900 heat-treated 17-4 stainless steel construction for durability and precision
• Accepts OPS 12th model OCM5 and AEM5 suppressors
• 1/2×28 thread pattern compatible with standard AR barrels
• Includes shim kit for precise timing and alignment
• Available in black nitride or raw heat-treated finish
• Fits barrels .75" OD or smaller with minimum 2.05" exposed barrel

Specifications

Brand	Otter Creek Labs
Material	H900 heat-treated 17-4 stainless steel
Thread Pattern	1/2×28
Max Barrel OD	.75"
Min Exposed Barrel	2.05" (measured from shoulder)
Suppressor Compatibility	OPS 12th model OCM5, AEM5
Finish Options	Black nitride or raw heat treat
Included Accessories	Shim kit for timing

Frequently Asked Questions

What suppressors does the OTB Muzzle Brake mount?

The OTB Muzzle Brake is designed to mount OPS 12th model OCM5 and AEM5 suppressors. It uses the included shim kit to dial in precise timing and alignment with your specific barrel.

Can I use a crush washer to install this muzzle brake?

No. Do not use a crush washer with this muzzle device. The shim kit method is the only approved installation approach. Using a crush washer will void your warranty.

What barrels does this fit?

The OTB Muzzle Brake fits any barrel with 1/2×28 threads, an outside diameter of .75" or smaller, and a minimum of 2.05" of exposed barrel measured from the shoulder. No custom barrel work or collars are needed.

Is custom gunsmithing required to install this?

No custom barrel work is necessary. The OTB Muzzle Brake is a direct-mount adapter that installs using the included shim kit for timing. As long as your barrel meets the thread pattern and length requirements, installation is straightforward.