The AAC Mk13-SD 90T Muzzle Brake (brand part number 64133) is a 7.62mm/.308 muzzle device built by Advanced Armament Corp specifically to mount the company’s Mk13-SD 90T sound suppressor. Machined from high-strength aerospace-grade steel alloy and finished in AAC’s hard, corrosion-resistant SCARmor coating, it’s built to handle hard use on a duty or precision rifle. The 5/8-24 threaded brake ships complete with Rocksett thread locker and a shim kit so it can be properly timed on installation. Because the mount geometry is proprietary to AAC’s 90T system, it’s a dedicated match for shooters already running or planning to add the Mk13-SD/300-SD suppressor family.

Key Specifications

• Chambered for .308 Winchester / 7.62 NATO caliber rifles.
• Threaded 5/8-24 to mate directly with AAC’s mounting system.
• Purpose-built to mount the AAC Mk13-SD 90T sound suppressor.
• Not compatible with any AAC silencer outside the Mk13-SD/300-SD family.
• Machined from high-strength aerospace-grade steel alloy for durability.
• Finished in AAC’s SCARmor coating for hardness and corrosion resistance.
• Ships with Rocksett thread locker included for a secure installation.
• Includes a shim kit for properly timing the brake on the muzzle.

Frequently Asked Questions

Will this fit any other AAC suppressor? No, it’s proprietary to the Mk13-SD 90T mount system and isn’t compatible with any AAC silencer outside the Mk13-SD/300-SD family.

What comes in the box? Rocksett thread locker and a shim kit for properly timing the brake ship with every unit.

What caliber is it rated for? It’s built for .308 Winchester/7.62 NATO rifles.

Buy the AAC Mk13-SD 90T Muzzle Brake, 7.62mm, 5/8-24

Get your 7.62 build ready to accept AAC’s Mk13-SD 90T suppressor with a brake built to the same spec as the factory system. Order it from our Advanced Armament Corp lineup, part of our AR muzzle devices selection, at our Lubbock, Texas gun shop — order now and we’ll get it out to you as soon as it’s ready to ship.