The KAK Industry Plan B Big Hole Brake (brand part no. 411-2103-003) is threaded 5/8×24 with a .375-inch bore, sized for .308/7.62 NATO barrels. Plan B devices taper before the threads, giving repeatable lockup and a proper seal against a Plan B suppressor mount. KAK recommends Rocksett and 20-25 ft-lbs of torque for installation, and notes that some suppressor makers won’t honor a warranty claim if a different brand’s muzzle device is used with their can.

Key Specifications

• Threaded 5/8×24.
• Bored to .375 inches, sized for .308/7.62 NATO barrels.
• Built as a brake, cutting felt recoil and muzzle rise.
• Cataloged by KAK as the Plan B Big Hole Brake.
• Tapers before the threads for repeatable lockup and a proper seal against a Plan B mount.
• Compatible with Plan B suppressor mounts.
• KAK recommends Rocksett and 20-25 ft-lbs of torque for installation.
• Some suppressor makers may void their warranty if a different brand’s muzzle device is used.

Frequently Asked Questions

How should this be installed? KAK recommends using Rocksett thread locker and torquing to 20-25 ft-lbs.

Will my suppressor’s warranty still apply? Some suppressor manufacturers won’t honor a warranty claim if a different brand’s muzzle device is used with their can, so check with your suppressor’s maker first.

What bore size does this brake use? .375 inches, sized for .308/7.62 NATO barrels.

Buy the KAK Plan B Big Hole Brake, 5/8×24, .375

Order the KAK Industry Plan B Big Hole Brake through our KAK Industry lineup at Schaefer Defense and we will ship it fast, fully insured, from our Lubbock, TX gun shop, along with more AR muzzle devices.